Statewide opinion polling for the 2020 Democratic Party presidential primaries

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This is a list of statewide public opinion polls that have been conducted relating to the Democratic primaries for the 2020 United States presidential election. The persons named in the polls are declared candidates or have received media speculation about their possible candidacy.

Given the large number of potential candidates, the scores of certain low-polling and infrequently-polled candidates have been combined within the "other" column; their exact scores may be viewed by viewing the footnotes associated with each poll. The polls included are among Democrats or Democrats and Democratic-leaning independents, and do not include Republican-leaning independents. The statewide polls are ordered by the scheduled date of the state's primary or caucus. Open-ended polls are included and marked with an asterisk (*), but closed-ended versions of such polls are listed where possible. If multiple versions of polls are provided, the version used for debate qualification is prioritized, then the version among likely voters, then registered voters, then adults.

The Democratic National Committee has determined that candidates may qualify for the first two Democratic primary debates either by polling at 1% or higher in at least three national or early-state (Iowa, New Hampshire, Nevada, and South Carolina) polls sponsored or conducted by designated organizations (in different regions if by the same organization) published after January 1, 2019, up until June 12, 2019, or by a fundraising threshold requiring at least 65,000 unique donors with at least 200 in 20 different states. Should more than 20 candidates meet either threshold, then candidates meeting both thresholds will be given highest priority for entry into the debates, followed by those with the highest polling average and those with the most donors. The pollsters and sponsors of polls designated for consideration by the DNC are the Associated Press, ABC News, CBS News, CNN, The Des Moines Register, Fox News, the Las Vegas Review-Journal, Monmouth University, NBC News, The New York Times, National Public Radio, Quinnipiac University, Reuters, the University of New Hampshire, USA Today, The Wall Street Journal, The Washington Post, and Winthrop University.^[1] Open-ended polls do not count towards the polling threshold.^[2]

For the third and fourth primary debates, candidates will be required to meet both polling and fundraising thresholds, with the prior considering only polls between June 28 and August 28, 2019, and increased to 4 qualifying polls at 2% support, now excluding surveys sponsored by the Las Vegas Review-Journal and Reuters; the latter requirement has also been increased, to 130,000 unique donors with at least 400 in 20 different states.^[3]

Individuals who have been included in national Democratic primary polls but have either ruled out their candidacy or not expressed interest in running include Stacey Abrams, Michael Avenatti, Sherrod Brown, Hillary Clinton, Mark Cuban, Andrew Cuomo, Al Franken, Eric Garcetti, Tim Kaine, Jason Kander, Joe Kennedy III, John Kerry, Mitch Landrieu, Terry McAuliffe, Chris Murphy, Gavin Newsom, Michelle Obama, Howard Schultz, Oprah Winfrey, and Mark Zuckerberg.

The following Morning Consult^[4] weekly poll archive^[5][6][7] graph depicts the evolution of the standing of each candidate in the early primary states (Iowa, New Hampshire, Nevada and South Carolina) since February 2019.

Graphs are unavailable due to technical issues. There is more info on Phabricator and on MediaWiki.org.

The following Morning Consult^{[8][9][10][11][12][13][14][15]} graph depicts the evolution of the standing of each candidate in the March 3, 2020 Super Tuesday states (Alabama, Arkansas, California, Colorado, Maine, Massachusetts, Minnesota, North Carolina, Oklahoma, Tennessee, Texas, Utah, Vermont, and Virginia) since January 7, 2020.

Graphs are unavailable due to technical issues. There is more info on Phabricator and on MediaWiki.org.

The following dates reflect either the confirmed or expected dates of Democratic primaries and caucuses in 2020. Those for contests in U.S. territories with no date yet set are based on dates estimated by The Green Papers based on past years. The pledged delegate numbers listed below are based on the presidential votes in 2008, 2012, and 2016, as well as the number of electoral votes of each state in 2020. The number of DNC members and distinguished party leaders in the count of unpledged PLEO (party leaders and elected officials) delegates is based on the 2016 Democratic National Convention, while the number of unpledged officeholders (governors, members of Congress, and their equivalents in non-state jurisdictions) reflects their current total. The numbers of pledged delegates do not yet account for delegate bonuses or penalties from timing or clustering.^[16][17][18]

States listed with a lavender background and an asterisk (*) do not yet have a date set by existing statute. States with a light yellow background and a dagger (†) are set to shift their primary or caucus date following the expected passage of legislation moving the dates of their contests. If not already listed as such, the date to which the contest is expected to be moved is listed in parentheses. Party-run primaries (also described as either a firehouse primary or caucus in some jurisdictions) are listed with two asterisks (**).^[16][17][18]

2020 Democratic Primaries and Caucuses

Date	State/territory	Type	Eligibility	P	U	T
Feb 3	Iowa	Caucus	Closed	41	8	49
Feb 11	New Hampshire	Primary	Mixed	24	9	33
Feb 22	Nevada	Caucus	Closed	36	12	48
Feb 29	South Carolina	Primary	Open	54	9	63
Mar 3	Alabama	Primary	Open	52	9	61
	American Samoa*	Caucus	Open	6	5	11
	Arkansas	Primary	Open	31	5	36
	California	Primary	Mixed	416	79	495
	Colorado	Primary	Mixed	67	13	80
	Maine	Primary	Closed	24	8	32
	Massachusetts	Primary	Mixed	91	23	114
	Minnesota	Primary	Closed	75	17	92
	North Carolina	Primary	Mixed	110	12	122
	Oklahoma	Primary	Mixed	37	5	42
	Tennessee	Primary	Open	64	9	73
	Texas	Primary	Closed	228	34	262
	Utah	Primary	Mixed	29	6	35
	Vermont	Primary	Open	16	7	23
	Virginia	Primary	Open	99	25	124
Mar 3–10	Democrats Abroad	Caucus**	Open	13	4	17
Mar 10	Idaho	Primary	Closed	20	5	25
	Michigan	Primary	Open	125	22	147
	Mississippi	Primary	Open	36	5	41
	Missouri	Primary	Open	68	10	78
	North Dakota	Caucus**	Open	14	4	18
	Washington	Primary	Closed	89	18	107
Mar 14	Northern Marianas*	Caucus	Closed	6	5	11
Mar 17	Arizona	Primary	Closed	67	11	78
	Florida	Primary	Closed	219	29	248
	Illinois	Primary	Open	155	29	184
Apr 7	Wisconsin	Primary	Open	84	13	90
Apr 10	Alaska	Primary**	Closed	15	4	18
Apr 17	Wyoming	Caucus	Closed	13	4	17
Apr 28	Ohio	Primary	Mixed	136	17	153
May 2	Guam*	Caucus	Closed	7	5	11
	Kansas	Primary**	Closed	39	6	39
May 12	Nebraska	Primary	Mixed	29	4	29
May 19	Oregon	Primary	Closed	61	14	66
May 22	Hawaii	Primary**	Closed	24	9	31
Jun 2	Delaware	Primary	Closed	21	11	28
	District of Columbia†	Primary	Closed	20	26	43
	Indiana	Primary	Open	82	7	77
	Maryland	Primary	Closed	96	23	102
	Montana	Primary	Open	19	6	22
	New Mexico	Primary	Closed	34	11	40
	Pennsylvania	Primary	Closed	186	23	176
	Rhode Island	Primary	Mixed	26	9	30
	South Dakota	Primary	Mixed	16	5	19
Jun 6	Virgin Islands*	Caucus	Closed	7	6	13
Jun 9	Georgia	Primary	Open	105	15	120
	West Virginia	Primary	Mixed	28	6	30
Jun 23	Kentucky	Primary	Closed	54	6	52
	New York†	Primary	Closed	273	46	270
Jul 7	New Jersey	Primary	Mixed	126	21	128
Jul 11	Louisiana	Primary	Closed	54	7	57
Jul 12	Puerto Rico	Primary	Open	51	8	59
Aug 11	Connecticut	Primary	Closed	60	15	64
N/A	Unassigned	–	–	–	1	1
Total delegates				3,979	765	4,744

The Iowa Democratic caucus was held on February 3, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Bernie Sanders	Joe Biden	Pete Buttigieg	Elizabeth Warren	Amy Klobuchar	Andrew Yang	Tom Steyer	Other	Un- decided[a]
270 to Win[19]	Feb 3, 2020	Jan 22 – Feb 2, 2020	22.6%	18.2%	15.2%	15.6%	11.8%	3.8%	3.6%	3.6%[b]	5.6%
RealClear Politics[20]	Feb 3, 2020	Jan 20 – Feb 2, 2020	23.0%	19.3%	16.8%	15.5%	9.0%	3.3%	3.0%	2.5%[c]	7.6%
FiveThirtyEight[21]	Feb 3, 2020	until Feb 2, 2020[d]	22.2%	20.7%	15.7%	14.5%	10.1%	3.7%	3.6%	2.9%[e]	6.6%
Average			22.6%	19.4%	15.9%	15.2%	10.3%	3.6%	3.4%	3.0%[f]	6.6%

The results of a final poll from The Des Moines Register were not released as scheduled on February 1, after an interviewee complained that Pete Buttigieg was not given as a poll option during their interview, with the omission reportedly attributed to human error. As the polling firm was unable to determine whether the mistake was an isolated incident or not, pollster Ann Selzer decided to withhold the results of the poll altogether, marking the first time in 76 years that the final pre-caucus poll was not released by the Register.^[22][23] The poll was later leaked on Twitter, with results confirmed by FiveThirtyEight showing Sanders in the lead with 22%, followed by Warren with 18%, Buttigieg with 16% and Biden with 13%.^[24]

Polling from December 1, 2019, to February 3, 2020
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Pete Buttigieg	Tulsi Gabbard	Amy Klobuchar	Bernie Sanders	Tom Steyer	Elizabeth Warren	Andrew Yang	Other	Undecided
Emerson College[25]	Jan 30 – Feb 2, 2020	853 (LV)	± 3.3%	21%	15%	1%	11%	28%	4%	14%	5%	2%	–
Data for Progress[26] [1]	Jan 28 – Feb 2, 2020	2,394 (LV)	± 1.6%	24%[h]	22%	–	–	28%	–	25%	–	–	–
				18%	18%	2%	9%	22%	4%	19%	6%	2%[i]	–
YouGov/CBS News[27] (MRP)	Jan 22–31, 2020	1,835 (RV)	± 3%	25%	21%	[j]	5%	25%	[j]	16%	[j]	[j]	[j]
David Binder Research/Focus on Rural America[28]	Jan 28–30, 2020	300 (LV)	± 5.7%	46%[k]	–	–	–	40%	–	–	–	–	14%
				15%	19%	3%	11%	17%	3%	15%	1%	2%[l]	12%
American Research Group[29]	Jan 27–30, 2020	400 (LV)	± 4.0%	17%	9%	2%	16%	23%	3%	15%	5%	4%[m]	6%
Civiqs/Data for Progress[30]	Jan 26–29, 2020	615 (LV)	± 4.7%	20%[n]	18%	1%	0%	31%	2%	25%	1%	1%[o]	2%
				15%	15%	2%	8%	28%	2%	21%	5%	0%[p]	2%
Park Street Strategies[31]	Jan 24–28, 2020	600 (LV)	± 3.0%	20%	17%	1%	12%	18%	4%	17%	5%	<1%[q]	6%
Monmouth University[32]	Jan 23–27, 2020	544 (LV)	± 4.2%	29%[r]	20%	–	–	25%	–	19%	–	1%[s]	6%
				22%[t]	17%	–	12%	22%	–	16%	5%	<1%[u]	6%
				23%	16%	1%	10%	21%	4%	15%	3%	1%[v]	5%
Civiqs/Iowa State University[33]	Jan 23–27, 2020	655 (LV)	± 4.8%	15%	17%	2%	11%	24%	4%	19%	5%	2%[w]	3%[x]
Emerson College[34]	Jan 23–26, 2020	450 (LV)	± 4.6%	21%	10%	5%	13%	30%	5%	11%	5%	2%[y]	–
Suffolk University/USA Today[35]	Jan 23–26, 2020	500 (LV)	± 4.4%	25.4%	17.6%	0.8%	5.6%	18.6%	2.2%	13.2%	3.0%	13.6%[z]	–
Change Research/Crooked Media[36]	Jan 22–26, 2020	704 (LV)	± 3.7%	22%[aa]	23%	–	–	30%	–	20%	–	–	5%
				18%	19%	1%	10%	27%	4%	15%	4%	2%[ab]	–
Siena College/New York Times[37]	Jan 20–23, 2020	584 (LV)	± 4.8%	23%[ac]	23%	–	–	30%	–	19%	–	–	8%[ad]
				17%	18%	1%	8%	25%	3%	15%	3%	1%[ae]	8%
Morningside College[38]	Jan 17–23, 2020	253 (LV)	± 6.2%	19%	18%	3%	12%	15%	6%	15%	4%	2%[af]	4%
YouGov/CBS News[39]	Jan 16–23, 2020	1401 (RV)	± 3.9%	25%	22%	0%	7%	26%	1%	15%	1%	2%[ag]	1%
Civiqs/Data for Progress[40][permanent dead link]	Jan 19–21, 2020	590 (LV)	± 4.8%	17%	19%	2%	6%	24%	3%	19%	5%	0%[ah]	5%
David Binder Research/Focus on Rural America[41]	Jan 15–18, 2020	500 (LV)	± 4.4%	24%	16%	1%	11%	14%	4%	18%	3%	2%[ai]	–
Neighbourhood Research and Media/Breitbart[42]	Jan 14–17, 2020	300 (LV)	± 4.8%	23%	17%	–[aj]	11%	10%	2%	15%	2%	6%[ak]	13%
	Jan 13, 2020	Booker withdraws from the race
Monmouth University[43]	Jan 9–12, 2020	405 (LV)	± 4.9%	28%[al]	25%	–	–	24%	–	16%	–	2%[am]	4%
				24%	17%	2%	8%	18%	4%	15%	4%	4%[an]	5%
Selzer/CNN/Des Moines Register[44]	January 2–8, 2020	701 (LV)	± 3.7%	15%	16%	2%	6%	20%	2%	17%	5%	2%[ao]	11%
YouGov/CBS News[45]	Dec 27, 2019 – Jan 3, 2020	953 (RV)	± 3.8%	23%	23%	1%	7%	23%	2%	16%	2%	2%[ap]	1%
KG Polling[46]	Dec 19–23, 2019	750 (LV)	± 3.8%	24%	12%	–	5%	31%	–	13%	10%	–	5%[aq]
Civiqs/Iowa State University[47]	Dec 12–16, 2019	632 (LV)	± 4.9%	15%	24%	3%	4%	21%	2%	18%	3%	4%[ar]	4%
Emerson College[48]	Dec 7–10, 2019	325 (LV)	± 5.4%	23%	18%	2%	10%	22%	3%	12%	2%	8%[as]	–
	Dec 3, 2019	Harris withdraws from the race

Polling during November 2019
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Pete Buttigieg	Tulsi Gabbard	Kamala Harris	Amy Klobuchar	Bernie Sanders	Tom Steyer	Elizabeth Warren	Andrew Yang	Other	Undecided
Civiqs/Iowa State University[49]	Nov 15–19, 2019	614 (LV)	± 4.9%	12%	26%	2%	2%	5%	18%	2%	19%	4%	6%[at]	3%
Des Moines Register/CNN[50]	Nov 8–13, 2019	500 (LV)	± 4.4%	15%	25%	3%	3%	6%	15%	3%	16%	3%	6%[au]	5%
YouGov/CBS News[51]	Nov 6–13, 2019	856 (RV)	± 4.1%	22%	21%	0%	5%	5%	22%	2%	18%	1%	4%[av]	–
Monmouth University[52]	Nov 7–11, 2019	451 (LV)	± 4.6%	19%	22%	2%	3%	5%	13%	3%	18%	3%	6%[aw]	8%
University of Iowa[53]	Oct 28 – Nov 10, 2019	465 (LV)	± 4.6%	15%	16%	3%	2%	1%	18%	3%	23%	3%	2%[ax]	13%
Public Policy Polling[54]	Nov 5–6, 2019	715 (LV)	–	13%	20%	–	3%	9%	14%	6%	21%	3%	–	10%
Quinnipiac University[55]	Oct 30 – Nov 5, 2019	698 (LV)	± 4.5%	15%	19%	3%	4%	5%	17%	3%	20%	3%	4%[ay]	8%
	Nov 1, 2019	O'Rourke withdraws from the race

Polling before November 2019
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Cory Booker	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Other	Undecided
Siena College/New York Times[56]	Oct 25–30, 2019	439 (LV)	± 4.7%	17%	2%	18%	3%	4%	1%	19%	22%	8%[az]	6%
Civiqs/Iowa State University[57]	Oct 18–22, 2019	598 (LV)	± 5%	12%	1%	20%	3%	4%	1%	18%	28%	8%[bb]	4%
Suffolk University/USA Today[58]	Oct 16–18, 2019	500 (LV)	± 4.4%	18%	1%	13%	3%	3%	1%	9%	17%	7%[bc]	29%
Emerson College[59]	Oct 13–16, 2019	317 (LV)	± 5.5%	23%	3%	16%	2%	1%	0%	13%	23%	15%[bd]	–
Firehouse Strategies/Øptimus[60]	Oct 8–10, 2019	548 (LV)	± 3.6%	22%	2%	17%	3%	–[be]	1%	5%	25%	26%[bf]	–[be]
YouGov/CBS News[61]	Oct 3–11, 2019	729 (RV)	± 4.6%	22%	2%	14%	5%	2%	2%	21%	22%	7%[bg]	–
Selzer/CNN/Des Moines Register[62] [2]	Sep 14–18, 2019	602 (LV)	± 4.0%	20%	3%	9%	6%	3%	2%	11%	22%	11%[bh]	14%
David Binder Research[63]	Sep 14–17, 2019	500 (LV)	± 4.4%	25%	2%	12%	5%	8%	1%	9%	23%	9%[bi]	6%
Civiqs/Iowa State University[64]	Sep 13–17, 2019	572 (LV)	± 5.2%	16%	2%	13%	5%	3%	2%	16%	24%	11%[bj]	8%
YouGov/CBS News[65]	Aug 28 – Sep 4, 2019	835	± 4.3%	29%	2%	7%	6%	2%	2%	26%	17%	9%[bk]	–
Change Research[66]	Aug 9–11, 2019	621 (LV)	± 3.9%	17%	3%	13%	8%	2%	3%	17%	28%	9%[bl]	–
Monmouth University[67]	Aug 1–4, 2019	401 (LV)	± 4.9%	28%	1%	8%	11%	3%	<1%	9%	19%	11%[bm]	10%
Firehouse Strategies/Øptimus[68]	Jul 23–25, 2019	630	± 3.3%	23%	2%	7%	12%	–	2%	11%	23%	4%	16%
YouGov/CBS News[69]	Jul 9–18, 2019	706	± 4.4%	24%	3%	7%	16%	4%	1%	19%	17%	9%[bn]	–
	Jul 9, 2019	Steyer announces his candidacy
Change Research[70]	Jun 29 – Jul 4, 2019	420 (LV)	–	16%	1%	25%	16%	1%	2%	16%	18%	5%[bo]	–
David Binder Research[71]	Jun 29 – Jul 1, 2019	600	± 4.0%	17%	2%	10%	18%	4%	1%	12%	20%	9%[bp]	9%
Suffolk University/USA Today[72]	Jun 28 – Jul 1, 2019	500	± 4.4%	24%	2%	6%	16%	2%	1%	9%	13%	6%[bq]	21%
Change Research[73]	Jun 17–20, 2019	308 (LV)	–	27%	5%	17%	4%	2%	1%	18%	20%	7%[br]	–
Selzer/CNN/Des Moines Register[74]	Jun 2–5, 2019	600	± 4.0%	24%	1%	14%	7%	2%	2%	16%	15%	6%[bs]	6%
Change Research[75]	May 15–19, 2019	615 (LV)	± 3.9%	24%	1%	14%	10%	2%	5%	24%	12%	9%[bt]	–
Firehouse Strategies/Øptimus[76]	Apr 30 – May 2, 2019	576	± 4.1%	35%	2%	11%	5%	4%	3%	14%	10%	–	16%
	Apr 25, 2019	Biden announces his candidacy
Gravis Marketing[77]	Apr 17–18, 2019	590	± 4.0%	19%	4%	14%	6%	4%	5%	19%	6%	7%[bu]	16%
	Apr 14, 2019	Buttigieg announces his candidacy
Monmouth University[78]	Apr 4–9, 2019	351	± 5.2%	27%	3%	9%	7%	4%	6%	16%	7%	7%[bv]	12%
David Binder Research[79]	Mar 21–24, 2019	500	± 4.4%	25%	7%	6%	9%	6%	6%	17%	8%	9%[bw]	7%
Emerson College[80]	Mar 21–24, 2019	249	± 6.2%	25%	6%	11%	10%	2%	5%	24%	9%	8%[bx]	–
Public Policy Polling (D)[81][by]	Mar 14–15, 2019	678	–	29%	4%	–	5%	6%	7%	15%	8%	4%	22%
	Mar 14, 2019	O'Rourke announces his candidacy
Selzer/CNN/Des Moines Register[82]	Mar 3–6, 2019	401	± 4.9%	27%	3%	1%	7%	3%	5%	25%	9%	5%[bz]	10%
	Feb 19, 2019	Sanders announces his candidacy
	Feb 10, 2019	Klobuchar announces her candidacy
	Feb 9, 2019	Warren announces her candidacy
Firehouse Strategies/Øptimus[83]	Jan 31 – Feb 2, 2019	558	± 3.6%	25%	4%	–	17%	5%	4%	10%	11%	1%[ca]	25%
Emerson College[84]	Jan 30 – Feb 2, 2019	260	± 6.0%	29%	4%	0%	18%	3%	6%	15%	11%	15%[cb]	–
	Feb 1, 2019	Booker announces his candidacy
	Jan 21, 2019	Harris announces her candidacy
	Jan 11, 2019	Gabbard announces her candidacy
Change Research[85]	Dec 13–17, 2018	1,291 (LV)	–	20%	4%	–	7%	5%	19%	20%	7%	18%[cc]	–
Selzer/CNN/Des Moines Register[86]	Dec 10–13, 2018	455	± 4.6%	32%	4%	–	5%	3%	11%	19%	8%	7%[cd]	6%
David Binder Research[87]	Dec 10–11, 2018	500	± 4.4%	30%	6%	–	7%	10%	11%	13%	9%	8%[ce]	6%
David Binder Research[88]	Sep 20–23, 2018	500	± 4.4%	37%	8%	–	10%	–	–	12%	16%	6%[cf]	9%
	Nov 6, 2017	Yang announces his candidacy
Public Policy Polling (D)[89][cg]	Mar 3–6, 2017	1,062	–	–	17%	–	3%	11%	–	–	–	34%[ch]	32%

The New Hampshire Democratic primary was held on February 11, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Bernie Sanders	Pete Buttigieg	Elizabeth Warren	Joe Biden	Amy Klobuchar	Andrew Yang	Tulsi Gabbard	Tom Steyer	Other	Un- decided[a]
270 to Win[90]	Feb 10, 2020	Feb 4–9, 2020	27.3%	20.9%	13.1%	12.3%	10.3%	3.0%	2.7%	2.1%	1.9%[ci]	6.4%
RealClear Politics[91]	Feb 10, 2020	Feb 6–9, 2020	28.7%	21.3%	11.0%	11.0%	11.7%	3.7%	3.3%	1.7%	1.3%[cj]	6.3%
FiveThirtyEight[92]	Feb 10, 2020	until Feb 10, 2020[d]	26.0%	21.6%	12.5%	11.7%	10.3%	3.0%	2.9%	2.6%	3.5%[ck]	5.8%
Average			27.3%	21.3%	12.2%	11.7%	10.8%	3.2%	3.0%	2.1%	2.2%[cl]	6.2%
New Hampshire primary results (February 11, 2020)			25.6%	24.3%	9.2%	8.4%	19.7%	2.8%	3.3%	3.6%	2.7%[cm]	–

Polling from January 1, 2020, to February 11, 2020
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Pete Buttigieg	Tulsi Gabbard	Amy Klobuchar	Bernie Sanders	Tom Steyer	Elizabeth Warren	Andrew Yang	Other	Undecided
New Hampshire primary (popular vote)	Feb 11, 2020	–	–	8.4%	24.3%	3.3%	19.7%	25.6%	3.6%	9.2%	2.8%	2.7%[cn]	–
AtlasIntel[93]	Feb 8–10, 2020	431 (LV)	± 5.0%	12%	24%	3%	14%	24%	1%	11%	5%	–	6%
Data For Progress[94][co]	Feb 7–10, 2020	1296 (LV)	± 2.7%	9%	26%	3%	13%	28%	3%	14%	5%	–	–
American Research Group[95]	Feb 8–9, 2020	400 (LV)	–	13%	20%	3%	13%	28%	2%	11%	3%	5%[cp]	2%
Emerson College/WHDH[96]	Feb 8–9, 2020	500 (LV)	± 4.3%	10%	23%	2%	14%	30%	2%	11%	4%	4%[cq]	–
Change Research[97]	Feb 8–9, 2020	662 (LV)	± 3.8%	9%	21%	6%	8%	30%	3%	8%	5%	1%[cr]	9%
Suffolk University/Boston Globe/WBZ-TV[98]	Feb 8–9, 2020	500 (LV)	± 4.4%	12%	19%	3%	14%	27%	2%	12%	3%	3%[cs]	7%
Elucd[99]	Feb 7–9, 2020	492 (LV)	± 4.4%	8%	20%	–[ct]	12%	26%	–[cu]	10%	–[cv]	–[cw]	15%
University of New Hampshire/CNN[100]	Feb 6–9, 2020	365 (LV)	± 5.1%	11%	22%	5%	7%	29%	1%	10%	4%	1%[cx]	10%
Emerson College/WHDH[101]	Feb 7–8, 2020	500 (LV)	± 4.3%	11%	20%	3%	13%	30%	2%	12%	4%	4%[cy]	–
Suffolk University/Boston Globe/WBZ-TV[102]	Feb 7–8, 2020	500 (LV)	± 4.4%	10%	22%	2%	9%	24%	2%	13%	3%	3%[cz]	12%
Boston Herald/FPU/NBC10[103]	Feb 5–8, 2020	512 (LV)	–	14%	20%	0%	6%	23%	2%	16%	3%	3%[da]	13%
YouGov/CBS News[104]	Feb 5–8, 2020	848 (LV)	± 4.3%	12%	25%	2%	10%	29%	1%	17%	1%	3%[db]	–
University of New Hampshire/CNN[105]	Feb 5–8, 2020	384 (LV)	± 5.0%	12%	21%	5%	6%	28%	2%	9%	4%	2%[dc]	11%
Emerson College/WHDH[106]	Feb 6–7, 2020	500 (LV)	± 4.3%	11%	24%	5%	9%	31%	2%	11%	3%	3%[dd]	–
Suffolk University/Boston Globe/WBZ-TV[107]	Feb 6–7, 2020	500 (LV)	± 4.4%	11%	25%	2%	6%	24%	2%	14%	3%	4%[de]	9%
University of Massachusetts Lowell[108]	Feb 4–7, 2020	440 (LV)	± 6.5%	14%	17%	4%	8%	25%	5%	15%	3%	5%[df]	4%
University of New Hampshire/CNN[109]	Feb 4–7, 2020	365 (LV)	± 5.1%	11%	21%	6%	5%	28%	3%	9%	3%	3%[dg]	11%
Emerson College/WHDH[110]	Feb 5–6, 2020	500 (LV)	± 4.3%	11%	23%	6%	9%	32%	2%	13%	2%	3%[dh]	–
Suffolk University/Boston Globe/WBZ-TV[111]	Feb 5–6, 2020	500 (LV)	± 4.4%	11%	23%	4%	6%	24%	3%	13%	3%	4%[di]	12%
Marist/NBC News[112]	Feb 4–6, 2020	709 (LV)	± 4.7%	13%	21%	3%	8%	25%	4%	14%	4%	3%[dj]	5%
Suffolk University/Boston Globe/WBZ-TV[113]	Feb 4–5, 2020	500 (LV)	± 4.4%	12%	19%	5%	6%	25%	4%	11%	2%	1%[dk]	15%
Monmouth University[114]	Feb 3–5, 2020	503 (LV)	± 4.4%	17%	20%	4%	9%	24%	3%	13%	4%	2%[dl]	5%
				17%[dm]	22%	–	13%	27%	–	13%	–	3%[dn]	4%
				19%[do]	28%	–	–	28%	–	16%	–	3%[dp]	5%
Emerson College/WHDH[115]	Feb 3–5, 2020	500 (LV)	± 4.3%	12%	21%	5%	11%	31%	1%	12%	4%	2%[dq]	–
Suffolk University/Boston Globe/WBZ-TV[116]	Feb 3–4, 2020	500 (LV)	± 4.4%	15%	15%	5%	6%	24%	5%	10%	3%	1%[dr]	14%
Emerson College/WHDH[117]	Feb 2–4, 2020	500 (LV)	± 4.3%	13%	17%	6%	11%	32%	2%	11%	6%	3%[ds]	–
	Feb 3, 2020	Iowa caucuses
Suffolk University/Boston Globe/WBZ-TV[118]	Feb 2–3, 2020	500 (LV)	± 4.4%	18%	11%	5%	6%	24%	4%	13%	3%	3%[dt]	14%
Emerson College/WHDH[119]	Feb 1–3, 2020	500 (LV)	± 4.3%	13%	12%	4%	12%	32%	5%	13%	5%	4%[du]	–
Emerson College/WHDH[120]	Jan 31 – Feb 2, 2020	500 (LV)	± 4.3%	14%	13%	7%	8%	29%	8%	12%	7%	2%[dv]	–
Saint Anselm College[121]	Jan 29 – Feb 2, 2020	491 (LV)	± 4.4%	19%	14%	3%	11%	19%	5%	11%	4%	2%[dw]	11%
Boston Herald/FPU/NBC10[122] [3]	Jan 29 – Feb 1, 2020	454 (LV)	± 4.6%	24%	8%	3%	4%	31%	No voters	17%	1%	5%[dx]	7%
University of Massachusetts Lowell[123]	Jan 28–31, 2020	400 (LV)	± 6.4%	22%	12%	5%	6%	23%	6%	19%	2%	1%[dy]	4%
YouGov/UMass Amherst/WCVB[124]	Jan 17–29, 2020	500 (LV)	± 5.3%	20%	12%	5%	5%	25%	5%	17%	4%	2%[dz]	3%
American Research Group[125]	Jan 24–27, 2020	600 (LV)	± 4%	13%	12%	8%	7%	28%	2%	11%	5%	8%[ea]	6%
Boston Herald/FPU/NBC10[122]	Jan 23–26, 2020	407 (LV)	± 4.9%	22%	10%	3%	5%	29%	0%	16%	1%	7%[eb]	9%
Marist/NBC News[126]	Jan 20–23, 2020	697 (LV)	± 4.5%	15%	17%	6%	10%	22%	3%	13%	5%	2%[ec]	7%
University of New Hampshire/CNN[127]	Jan 15–23, 2020	516 (LV)	± 4.3%	16%	15%	5%	6%	25%	2%	12%	5%	2%[ed]	10%
MassINC Polling Group/WBUR[128]	Jan 17–21, 2020	426 (LV)	± 4.8%	14%	17%	5%	6%	29%	2%	13%	5%	4%[ee]	5%[ef]
Suffolk University/Boston Globe[129]	Jan 15–19, 2020	500 (LV)	± 4.4%	15%	12%	5%	5%	16%	3%	10%	6%	3%[eg]	24%
Emerson College/WHDH[130]	Jan 13–16, 2020	657 (LV)	± 3.8%	14%	18%	5%	10%	23%	4%	14%	6%	7%[eh]	–
	Jan 13, 2020	Booker withdraws from the race
Boston Herald/FPU/NBC10[131]	Jan 8–12, 2020	434 (LV)	–	26%	7%	4%	2%	22%	2%	18%	2%	7%[ei]	12%
Patinkin Research Strategies/Yang 2020[132][ej]	Jan 5–7, 2020	600 (LV)	± 4%	21%	17%	7%	6%	19%	6%	10%	5%	3%[ek]	7%
Monmouth University[133]	Jan 3–7, 2020	404 (LV)	± 4.9%	19%	20%	4%	6%	18%	4%	15%	3%	3%[el]	7%
				21%[em]	20%	–	7%	21%	–	15%	5%	5%[en]	8%
				24%[eo]	23%	–	–	21%	–	18%	–	5%[ep]	8%
YouGov/CBS News[134]	Dec 27, 2019 – Jan 3, 2020	487 (LV)	± 5.3%	25%	13%	1%	7%	27%	3%	18%	2%	3%[eq]	–

Polling before January 2020
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Cory Booker	Pete Buttigieg	Tulsi Gabbard	Kamala Harris	Amy Klobuchar	Beto O'Rourke	Deval Patrick	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
MassINC Polling Group/WBUR[135]	Dec 3–8, 2019	442 (LV)	± 4.7%	17%	1%	18%	5%	–	3%	–	<1%	15%	12%	5%	11%[er]	12%[es]
	Dec 3, 2019	Harris withdraws from the race
Emerson College[136]	Nov 22–26, 2019	549 (LV)	± 4.1%	14%	2%	22%	6%	4%	2%	–	0%	26%	14%	5%	7%[et]	–
Boston Globe/Suffolk University[137]	Nov 21–24, 2019	500 (LV)	–	12%	2%	13%	6%	3%	1%	–	1%	16%	14%	4%	6%[eu]	21%
Saint Anselm College[138]	Nov 13–18, 2019	255 (RV)	± 6.1%	15%	3%	25%	3%	1%	6%	–	0%	9%	15%	2%	5%[ev]	13%
	Nov 14, 2019	Patrick announces his candidacy
YouGov/CBS News[139]	Nov 6–13, 2019	535 (RV)	± 5%	22%	1%	16%	0%	3%	3%	–	–	20%	31%	1%	1%[ew]	–
Quinnipiac University[140]	Nov 6–10, 2019	1,134 (LV)	± 3.8	20%	1%	15%	6%	1%	3%	–	–	14%	16%	4%	5%[ex]	14%
	Nov 1, 2019	O'Rourke withdraws from the race
University of New Hampshire/CNN[141]	Oct 21–27, 2019	574 (LV)	± 4.1%	15%	2%	10%	5%	3%	5%	2%	–	21%	18%	5%	4%[ey]	10%
Boston Herald/FPU[142]	Oct 9–13, 2019	422 (LV)	± 4.8%	24%	2%	9%	1%	4%	2%	0%	–	22%	25%	1%	4%[ez]	7%
Firehouse Strategies/Øptimus[143]	Oct 8–10, 2019	610 (LV)	± 3.7%	18%	2%	7%	–[fa]	2%	–[fa]	1%	–	9%	25%	2%	32%	–[fa]
YouGov/CBS News[144]	Oct 3–11, 2019	506	± 5.4%	24%	1%	7%	2%	4%	2%	1%	–	17%	32%	5%	5%[fb]	–
Saint Anselm College[145]	Sep 25–29, 2019	423	± 4.8%	24%	1%	10%	3%	5%	3%	<1%	–	11%	25%	2%	3%[fc]	9%
Monmouth University[146]	Sep 17–21, 2019	401	± 4.9%	25%	2%	10%	2%	3%	2%	1%	–	12%	27%	2%	3%[fd]	9%
HarrisX/No Labels[147]	Sep 6–11, 2019	595	± 4.0%	22%	3%	5%	6%	5%	1%	1%	–	21%	15%	2%	5%[fe]	14%
Boston Herald/FPU[148]	Sep 4–10, 2019	425	± 4.8%	21%	1%	5%	3%	6%	1%	2%	–	29%	17%	5%	2%[ff]	9%
Emerson College[149]	Sep 6–9, 2019	483	± 4.4%	24%	4%	11%	6%	8%	1%	1%	–	13%	21%	3%	7%[fg]	–
YouGov/CBS News[150]	Aug 28 – Sep 4, 2019	526	± 5.2%	26%	2%	8%	1%	7%	1%	1%	–	25%	27%	1%	1%[fh]	–
Gravis Marketing[151]	Aug 2–6, 2019	250	± 6.2%	15%	0%	8%	5%	7%	4%	2%	–	21%	12%	4%	8%[fi]	11%
Suffolk University[152]	Aug 1–4, 2019	500	± 4.4%	21%	1%	6%	3%	8%	1%	0%	–	17%	14%	1%	6%[fj]	21%
Firehouse Strategies/Øptimus[153]	Jul 23–25, 2019	587	± 3.3%	21%	1%	8%	–	13%	–	0%	–	13%	16%	1%	7%	19%
YouGov/CBS News[154]	Jul 9–18, 2019	530	± 5%	27%	1%	7%	2%	12%	1%	2%	–	20%	18%	1%	5%[fk]	–
University of New Hampshire/CNN[155]	Jul 8–15, 2019	386	± 5.0%	24%	2%	10%	1%	9%	0%	2%	–	19%	19%	1%	4%[fl]	9%
Saint Anselm College[156]	Jul 10–12, 2019	351	± 5.2%	21%	1%	12%	1%	18%	3%	0%	–	10%	17%	5%	3%[fm]	11%
Change Research[157]	Jul 6–9, 2019	1,084	± 3.0%	19%	1%	13%	3%	15%	1%	1%	–	20%	22%	1%	3%[fn]	–
Change Research[158]	Jun 29 – Jul 4, 2019	420	–	13%	2%	14%	2%	13%	1%	2%	–	26%	24%	2%	4%[fo]	–
Change Research[159]	Jun 17–20, 2019	308	–	24%	0%	14%	1%	3%	1%	4%	–	28%	21%	1%	3%[fp]	–
YouGov/CBS News[160]	May 31 – Jun 12, 2019	502	± 4.9%	33%	3%	10%	0%	7%	1%	4%	–	20%	17%	1%	2%[fq]	–
Tel Opinion Research[161]*	May 20–22, 2019	600	± 4.0%	33%	–	7%	–	7%	–	1%	–	12%	11%	–	–	28%
Monmouth University[162]	May 2–7, 2019	376	± 5.1%	36%	2%	9%	0%	6%	2%	2%	–	18%	8%	1%	2%[fr]	11%
Change Research[163]	May 3–5, 2019	864	± 3.3%	26%	2%	12%	1%	8%	1%	3%	–	30%	9%	2%	4%[fs]	–
Firehouse Strategies/Øptimus[164]	Apr 30 – May 2, 2019	551	± 4.0%	34%	1%	10%	–	7%	1%	3%	–	16%	9%	–	–	19%
Suffolk University[165]	Apr 25–28, 2019	429	± 4.7%	20%	3%	12%	1%	6%	1%	3%	–	12%	8%	1%	4%[ft]	27%
	Apr 25, 2019	Biden announces his candidacy
University of New Hampshire[166]	Apr 10–18, 2019	241	± 6.3%	18%	3%	15%	1%	4%	2%	3%	–	30%	5%	2%	5%[fu]	12%
	Apr 14, 2019	Buttigieg announces his candidacy
Saint Anselm College[167]	Apr 3–8, 2019	326	± 5.4%	23%	4%	11%	1%	7%	2%	6%	–	16%	9%	–	9%[fv]	13%
	Mar 14, 2019	O'Rourke announces his candidacy
University of New Hampshire[168]	Feb 18–26, 2019	240	± 6.3%	22%	3%	1%	1%	10%	4%	5%	–	26%	7%	–	6%[fw]	14%
Emerson College[169]	Feb 21–22, 2019	405	± 4.8%	25%	5%	1%	–	12%	8%	5%	–	27%	9%	–	10%[fx]	–
	Feb 19, 2019	Sanders announces his candidacy
YouGov/UMass Amherst[170]	Feb 7–15, 2019	337	± 6.4%	28%	3%	–	–	14%	1%	6%	–	20%	9%	–	9%[fy]	9%
	Feb 10, 2019	Klobuchar announces her candidacy
	Feb 9, 2019	Warren announces her candidacy
Firehouse Strategies/Øptimus[171]	Jan 31 – Feb 2, 2019	518	± 4.1%	22%	4%	–	–	13%	2%	2%	–	13%	9%	–	0%[fz]	35%
	Feb 1, 2019	Booker announces his candidacy
	Jan 21, 2019	Harris announces her candidacy
	Jan 11, 2019	Gabbard announces her candidacy
Change Research[172]	Jan 2–3, 2019	1,162	–	24%	3%	–	–	4%	2%	9%	–	26%	11%	–	22%[ga]	–
University of New Hampshire[173]	Aug 2–19, 2018	198	± 7.0%	19%	6%	–	–	3%	–	–	–	30%	17%	–	12%[gb]	12%
Suffolk University[174]	Apr 26–30, 2018	295	± 5.7%	20%	8%	–	–	4%	–	–	4%	13%	26%	–	4%[gc]	18%
				30%	10%	–	–	6%	–	–	8%	25%	–	–	6%[gd]	12%
University of New Hampshire[175]	Apr 13–22, 2018	188	± 7.1%	26%	5%	–	–	6%	1%	–	–	28%	11%	–	9%[ge]	13%
University of New Hampshire[176]	Jan 28 – Feb 10, 2018	219	± 6.6%	35%	3%	–	–	1%	0%	–	–	24%	15%	–	7%[gf]	15%
	Nov 6, 2017	Yang announces his candidacy
University of New Hampshire[177]	Oct 3–15, 2017	212	± 6.7%	24%	6%	–	–	1%	1%	–	–	31%	13%	–	14%[gg]	11%

Head-to-head polls
Poll source	Date(s) administered	Sample size	Margin of error	Joe Biden	Pete Buttigieg	Bernie Sanders	Elizabeth Warren	Undecided
Tel Opinion Research[161]	May 20–22, 2019	600	± 4.0%	63%	21%	–	–	15%
				66%	–	22%	–	13%
				58%	–	–	29%	13%
American Research Group[178]	Mar 21–27, 2018	400	± 5.0%	47%	–	45%	–	7%
				58%	–	–	33%	8%

The Nevada Democratic caucus was held on February 22, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Bernie Sanders	Joe Biden	Pete Buttigieg	Elizabeth Warren	Tom Steyer	Amy Klobuchar	Others	Undecided[a]
270 to Win[179]	Feb 21, 2020	Feb 14–21, 2020	30.0%	16.7%	14.0%	13.7%	9.7%	9.7%	1.3%[gh]	4.9%
RealClear Politics[180]	Feb 21, 2020	Feb 19–21, 2020	32.5%	16.0%	16.0%	14.0%	9.0%	9.5%	2.0%[gi]	1.0%
FiveThirtyEight[181]	Feb 21, 2020	until Feb 21, 2020[d]	30.5%	14.4%	15.3%	11.8%	10.2%	8.9%	11.0%[gj]	–[gk]
Average			31.0%	15.7%	15.1%	13.2%	9.6%	9.4%	4.7%[gl]	2.0%
Nevada caucus results, first alignment (February 22, 2020)			34.0%	17.6%	15.4%	12.8%	9.1%	9.6%	1.5%[gm]	–

Tabulation of individual polls of the 2020 Nevada Democratic Caucus
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Cory Booker	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Beto O'Rourke	Bernie Sanders	Tom Steyer	Elizabeth Warren	Andrew Yang	Other	Undecided
Nevada caucuses (first alignment vote)	Feb 22, 2020	–	–	17.6%	–	15.4%	–	9.6%	–	34%	9.1%	12.8%	0.6%	1%[gn]	–
Data for Progress[182][4][go]	Feb 19–21, 2020	1010 (LV)	± 2.8%	16%	–	15%	–	8%	–	35%	8%	16%	–	2%[gp]	–
AtlasIntel[183]	Feb 19–21, 2020	517 (LV)	± 4.0%	11%	–	14%	–	5%	–	38%	11%	9%	–	7%[gq]	5%
Emerson College[184]	Feb 19–20, 2020	425 (LV)	± 4.7%	16%	–	17%	–	11%	–	30%	10%	12%	–	4%[gr]	–
	Feb 15–18, 2020	Early voting occurred in the Nevada caucuses[185]
Point Blank Political[186]	Feb 13–15, 2020	256 (LV)	± 5.6%	14.3%	–	12.6%	–	15.6%	–	13%	18.6%	7.1%	–	1.7%[gs]	17.1%
Beacon Research/Tom Steyer[187]	Feb 12–15, 2020	600 (LV)	–	19%	–	13%	–	7%	–	24%	18%	10%	–	4%[gt]	6%
Data for Progress[188][5][gu]	Feb 12–15, 2020	766 (LV)	± 3.4%	14%	–	15%	–	9%	–	35%	10%	16%	–	2%[gv]	–
WPA Intelligence/Las Vegas Review-Journal/AARP Nevada[189]	Feb 11–13, 2020	413 (LV)	± 4.8%	18%	–	10%	–	10%	–	25%	11%	13%	–	5%[gw]	8%
	Feb 11, 2020	New Hampshire primary; Yang withdraws from the race after close of polls
	Jan 13, 2020	Booker withdraws from the race
Suffolk University/USA Today[190][6]	Jan 8–11, 2020	500 (LV)	± 4.4%	19%	2%	8%	–	4%	–	18%	8%	11%	4%	4%[gx]	22%
https://www.yang2020.com/wp-content/uploads/Myers-Research-Nevada.pdf Archived January 11, 2020, at the Wayback Machine	Jan 5–8, 2020	635	± 4.0%	23%	3%	6%	–	2%	–	17%	12%	12%	4%	13%[gy]	6%
	Dec 3, 2019	Harris withdraws from the race
YouGov/CBS News[191]	Nov 6–13, 2019	708 (RV)	± 4.7%	33%	2%	9%	4%	2%	–	23%	2%	21%	1%	2%[gz]	–
Fox News[192]	Nov 10–13, 2019	627	± 4.0%	24%	1%	8%	4%	2%	–	18%	5%	18%	3%	4%[ha]	10%
Emerson Polling[193]	Oct 31 – Nov 2, 2019	451 (LV)	± 4.6%	30%	1%	5%	5%	1%	–	19%	3%	22%	5%	10%[hb]	–
Mellman Group/The Nevada Independent[194]	Oct 28 – Nov 2, 2019	600 (LV)	± 4.0%	29%	1%	7%	3%	3%	0%	19%	4%	19%	3%	3%[hc]	9%
	Nov 1, 2019	O'Rourke withdraws from the race
CNN/SSRS[195]	Sep 22–26, 2019	324 (LV)	± 7.1%	22%	2%	4%	5%	1%	0%	22%	4%	18%	3%	3%[hd]	13%
Suffolk University/USA Today[196]	Sep 19–23, 2019	500 (LV)	–	23%	2%	3%	4%	0%	1%	14%	3%	19%	3%	4%[he]	21%
YouGov/CBS News[197]	Aug 28 – Sep 4, 2019	563 (LV)	± 4.9%	27%	1%	4%	6%	0%	3%	29%	2%	18%	1%	9%[hf]	–
Gravis Marketing[198]	Aug 14–16, 2019	382 (RV)	± 5.0%	25%	3%	5%	9%	2%	0%	10%	6%	15%	2%	13%[hg]	9%
Change Research[199]	Aug 2–8, 2019	439 (LV)	± 4.7%	26%	0%	7%	10%	1%	2%	22%	3%	23%	1%	5%[hh]	–
Morning Consult[200]	Jul 1–21, 2019	749 (RV)	± 4.0%	29%	3%	6%	11%	1%	3%	23%	1%	12%	3%	10%[hi]	–
	Jul 9, 2019	Steyer announces his candidacy
Monmouth University[201]	Jun 6–11, 2019	370 (LV)	± 5.1%	36%	2%	7%	6%	1%	2%	13%	–	19%	2%	3%[hj]	8%
Change Research[202]	May 9–12, 2019	389 (LV)	–	29%	2%	13%	11%	1%	4%	24%	–	12%	1%	4%[hk]	–
	Apr 25, 2019	Biden announces his candidacy
	Apr 14, 2019	Buttigieg announces his candidacy
Emerson College[203]	Mar 28–30, 2019	310 (LV)	± 5.5%	26%	2%	5%	9%	2%	10%	23%	–	10%	3%	9%[hl]	–

The South Carolina Democratic primary was held on February 29, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Tom Steyer	Pete Buttigieg	Elizabeth Warren	Amy Klobuchar	Tulsi Gabbard	Un- decided[hm]
270 to Win[204]	Feb 28, 2020	Feb 23–27, 2020	35.8%	20.2%	13.4%	10.0%	8.2%	5.0%	2.6%	4.8%
RealClear Politics[205]	Feb 28, 2020	Feb 23–27, 2020	39.7%	24.3%	11.7%	11.3%	6.0%	5.7%	2.3%	–[hn]
FiveThirtyEight[206]	Feb 28, 2020	until Feb 27, 2020[d]	38.4%	19.1%	12.4%	8.5%	7.0%	4.3%	2.6%	7.7%[ho]
Average			38.0%	21.2%	12.5%	9.9%	7.1%	5.0%	2.5%	4.9%[hp]
South Carolina primary results (February 29, 2020)			48.7%	19.8%	11.3%	8.2%	7.1%	3.1%	1.3%	–

Polling in January and February 2020
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Tulsi Gabbard	Amy Klobuchar	Bernie Sanders	Tom Steyer	Elizabeth Warren	Andrew Yang	Other	Undecided
South Carolina primary (popular vote)	Feb 29, 2020	–	–	48.65%	–	8.2%	1.26%	3.13%	19.77%	11.34%	7.07%	0.2%	0.38%[hq]	–
Atlas Intel[207]	Feb 25–28, 2020	477 (LV)	± 4.0%	35%	–	8%	2%	4%	24%	12%	7%	–	2%	6%
Emerson College[208]	Feb 26–27, 2020	550 (LV)	± 4.1%	41%	–	11%	2%	6%	25%	11%	5%	–	–	–
Trafalgar Group[209]	Feb 26–27, 2020	1,081 (LV)	± 2.99%	43.9%	–	9.6%	1.7%	5.9%	22.8%	10.5%	5.6%	–	–	–
Data for Progress[210]	Feb 23–27, 2020	1416 (LV)	± 2.6%	34%	–	13%	3%	5%	25%	13%	7%	–	–	–
Change Research[211] [7]/ Post and Courier	Feb 23–27, 2020	543 (LV)	± 5.1%	28%	–	11%	5%	4%	24%	16%	12%	–	–	1%
Starboard Communications[212]	Feb 26, 2020	1,102 (LV)	± 2.82%	40%	–	9%	2%	6%	11%	12%	9%	–	–	12%
	Feb 25, 2020	Tenth Democratic primary debate
Monmouth University[213]	Feb 23–25, 2020	454 (LV)	± 4.6%	36%	–	6%	1%	4%	16%	15%	8%	–	0%	15%
Clemson University[214]	Feb 17–25, 2020	650 (LV)	± 3.8%	35%	–	8%	2%	4%	13%	17%	8%	–	–	12%
East Carolina University[215]	Feb 23–24, 2020	1,142 (LV)	± 3.37%	31%	–	6%	2%	2%	23%	20%	8%	–	–	8%
Public Policy Polling[216]	Feb 23–24, 2020	866 (LV)	± 3.3%	36%	–	7%	6%	3%	21%	7%	8%	–	–	11%[hr]
	Feb 22, 2020	Nevada caucuses
YouGov/CBS News[217]	Feb 20–22, 2020	1,238 (LV)	± 5.5%	28%	–	10%	1%	4%	23%	18%	12%	–	3%[hs]	1%
Marist Poll/NBC News[218]	Feb 18–21, 2020	539 (LV)	± 6.0%	27%	–	9%	3%	5%	23%	15%	8%	–	2%[ht]	9%
		997 (RV)	± 4.0%	25%	–	9%	3%	5%	24%	15%	8%	–	2%[hu]	9%
Winthrop University[219]	Feb 9–19, 2020	443 (LV)	± 4.7%	24%	–	7%	1%	4%	19%	15%	6%	1%[hv]	2%[hw]	22%
University of Massachusetts Lowell[220]	Feb 12–18, 2020	400 (LV)	± 7.5%	23%	–	11%	4%	9%	21%	13%	11%	–	4%[hx]	4%
Change Research/The Welcome Party[221]	Feb 12–14, 2020	1015 (LV)	–	23%	–	15%	1%	8%	23%	20%	9%	–	–	1%
East Carolina University[222]	Feb 12–13, 2020	703 (LV)	± 4.3%	28%	6%	8%	1%	7%	20%	14%	7%	–	0%	8%
	Feb 11–12, 2020	New Hampshire primary; Yang withdraws from the race.
	Feb 3, 2020	Iowa caucus
Zogby Analytics[223]	Jan 31 – Feb 3, 2020	277 (LV)	± 5.9%	28%	4%	7%	4%	2%	20%	15%	11%	1%	0%[hy]	8%
East Carolina University[224]	Jan 31 – Feb 2, 2020	469 (LV)	± 5.3%	37%	1%	4%	2%	2%	14%	19%	8%	3%	0%[hz]	10%
Change Research/ Post and Courier[225]	Jan 26–29, 2020	651 (LV)	± 4%	25%	–	7%	3%	2%	20%	18%	11%	3%	1%[ia]	10%
	Jan 13, 2020	Booker withdraws from the race
GQR Research/Unite the Country[226][ib]	Jan 9–13, 2020	600 (LV)	–	36%[ic]	–[id]	5%[ie]	–[if]	–[ig]	15%[ih]	12%[ii]	10%[ij]	–[ik]	–[il]	–[im]
Fox News[227]	Jan 5–8, 2020	808 (RV)	± 3.5%	36%	2%	4%	1%	1%	14%	15%	10%	2%	3%[in]	11%

Polling before January 2020
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Cory Booker	Pete Buttigieg	Kamala Harris	Beto O'Rourke	Bernie Sanders	Tom Steyer	Elizabeth Warren	Other	Undecided
Change Research/ Post and Courier[228]	Dec 6–11, 2019	392 (LV)	± 4.9%	27%	5%	9%	–	–	20%	5%	19%	13%[io]	–
	Dec 3, 2019	Harris withdraws from the race
YouGov/FairVote[229] [8]	Nov 22 – Dec 2, 2019	400 (LV)	± 7.5%	39%	2%	10%	2%	–	13%	7%	10%	13%[ip]	4%
Quinnipiac University[230]	Nov 13–17, 2019	768 (LV)	± 4.8%	33%	2%	6%	3%	–	11%	5%	13%	7%[iq]	18%
YouGov/CBS News[231]	Nov 6–13, 2019	933 (RV)	± 4.2%	45%	2%	8%	5%	–	15%	2%	17%	6%[ir]	–
University of North Florida[232]	Nov 5–13, 2019	426 (LV)	–	36%	2%	3%	4%	–	10%	8%	10%	6%[is]	23%
	Nov 1, 2019	O'Rourke withdraws from the race
Monmouth University[233]	Oct 16–21, 2019	402 (LV)	± 4.9%	33%	2%	3%	6%	1%	12%	4%	16%	7%[it]	15%
Change Research/ Post and Courier[234]	Oct 15–21, 2019	731 (LV)	± 3.6%	30%	3%	9%	11%	1%	13%	5%	19%	11%[iu]	–
Firehouse Strategies/ Øptimus[235]	Oct 8–10, 2019	607 (LV)	± 3.7%	32%	2%	4%	5%	1%	8%	–	16%	33%[iv]	–[iw]
YouGov/CBS News[236]	Oct 3–11, 2019	915 (RV)	±3.9%	43%	3%	4%	7%	1%	16%	2%	18%	6%[ix]	–
Gravis Marketing[237]	Oct 3–7, 2019	516 (LV)	± 4.3%	34%	6%	0%	4%	2%	10%	7%	9%	10%[iy]	19%
Fox News[238]	Sep 29 – Oct 2, 2019	803 (LV)	± 3.5%	41%	3%	2%	4%	0%	10%	4%	12%	8%[iz]	16%
Winthrop University[219]	Sep 21–30, 2019	462 (RV)	± 4.9%	37%	3%	4%	7%	2%	8%	2%	17%	6%[ja]	12%
CNN/SSRS[239]	Sep 22–26, 2019	406 (LV)	± 5.9%	37%	2%	4%	3%	2%	11%	3%	16%	4%[jb]	10%
YouGov/CBS News[240]	Aug 28 – Sep 4, 2019	849 (RV)[jc]	± 4.3%	43%	2%	4%	7%	1%	18%	1%	14%	9%[jd]	–
Change Research[241]	Aug 9–12, 2019	521 (LV)	± 4.3%	36%	4%	5%	12%	1%	16%	1%	17%	7%[je]	–
Firehouse Strategies/ Øptimus[242]	Jul 23–25, 2019	554 (LV)	± 3.8%	31%	2%	4%	10%	0%	9%	–	12%	8%[jf]	24%
Monmouth University[243]	Jul 18–22, 2019	405 (LV)	± 4.9%	39%	2%	5%	12%	1%	10%	2%	9%	3%[jg]	17%
YouGov/CBS News[244]	Jul 9–18, 2019	997 (RV)[jh]	± 3.8%	39%	3%	5%	12%	2%	17%	1%	12%	9%[ji]	–
Fox News[245]	Jul 7–10, 2019	701 (LV)	± 3.5%	35%	3%	2%	12%	0%	14%	0%	5%	3%[jj]	20%
	Jul 9, 2019	Steyer announces his candidacy
Change Research[246]	Jun 29 – Jul 4, 2019	421 (LV)	–	27%	6%	6%	21%	1%	16%	0%	15%	8%[jk]	–
Change Research[247]	Jun 17–20, 2019	308 (LV)	–	39%	5%	11%	9%	5%	13%	0%	15%	5%[jl]	–
Change Research[248]	Jun 11–14, 2019	933 (LV)	± 3.2%	37%	5%	11%	9%	4%	9%	–	17%	8%[jm]	–
YouGov/CBS News[249]	May 31 – Jun 12, 2019	552 (LV)	–	45%	4%	6%	7%	4%	18%	–	8%	8%[jn]	–
Zogby Analytics[250]	May 23–29, 2019	183 (LV)	± 7.2%	36%	4%	7%	4%	2%	13%	–	12%	4%[jo]	–
Tel Opinion Research[251]*	May 22–24, 2019	600 (LV)	± 4.0%	37%	2%	3%	7%	–	10%	–	8%	–	32%
Crantford Research[252]	May 14–16, 2019	381 (LV)	± 5.0%	42%	4%	8%	10%	–	7%	–	8%	–	–
Change Research[253]	May 6–9, 2019	595 (LV)	± 4.0%	46%	4%	8%	10%	2%	15%	–	8%	5%[jp]	–
Firehouse Strategies/ Øptimus[254]	Apr 30 – May 2, 2019	568 (LV)	± 4.5%	48%	4%	5%	4%	1%	12%	–	5%	1%[jq]	20%
	Apr 25, 2019	Biden announces his candidacy
	Apr 14, 2019	Buttigieg announces his candidacy
Change Research[255]	Mar 31 – Apr 4, 2019	744 (LV)	± 3.6%	32%	9%	7%	10%	9%	14%	–	6%	12%[jr]	–
				–	12%	12%	15%	16%	24%	–	11%	12%[js]	–
	Mar 14, 2019	O'Rourke announces his candidacy
Emerson College[256]	Feb 28 – Mar 2, 2019	291 (LV)	± 5.7%	37%	6%	0%	9%	5%	21%	–	5%	16%[jt]	–
Change Research[257]	Feb 15–18, 2019	600 (LV)	± 4.0%	36%	10%	–	13%	8%	14%	–	9%	12%[ju]	–
				–	28%	1%	35%	–	–	–	20%	18%[jv]	–
	Feb 19, 2019	Sanders announces his candidacy
	Feb 9, 2019	Warren announces her candidacy
Firehouse Strategies/ Øptimus[258]	Jan 31 – Feb 2, 2019	557 (LV)	± 4.0%	36%	5%	–	12%	2%	8%	–	4%	2%[jw]	31%

Head-to-head polling
Poll source	Date(s) administered	Sample size	Margin of error	Joe Biden	Pete Buttigieg	Bernie Sanders	Elizabeth Warren	Other	Undecided
YouGov/FairVote[229][9][jx]	Nov 22 – Dec 2, 2019	400 (LV)	± 7.5%	73%	27%	–	–	–	–
				66%	–	34%	–	–	–
				61%	–	–	29%	[jy]	6%
				–	39%	61%	–	–	–
				–	36%	–	64%	–	–
				–	–	54%	46%	–	–
Tel Opinion Research[251]	May 22–24, 2019	600	± 4.0%	71%	10%	–	–	–	19%
				70%	–	15%	–	–	16%
				67%	–	–	15%	–	18%

The Alabama Democratic primary was held on March 3, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Michael Bloomberg	Elizabeth Warren	Tulsi Gabbard	Other/ Undecided[a]
270 to Win[259]	March 3, 2020	February 28 – March 2, 2020	44.5%	21.0%	18.0%	11.0%	1.0%	4.5%
RealClear Politics[260]	March 3, 2020	Insufficient recent polling to supply an average.
FiveThirtyEight[261]	March 3, 2020	until March 2, 2020[d]	40.2%	18.4%	15.9%	10.9%	0.5%	14.1%
Average			42.35%	19.7%	16.95%	10.95%	0.75%	9.3%
Alabama primary results (March 3, 2020)			63.3%	16.5%	11.7%	5.7%	0.2%	2.6%

Tabulation of individual polls of the 2020 Alabama Democratic Primary
Poll source	Date(s) administered	Sample size	Margin of error	Joe Biden	Michael Bloomberg	Cory Booker	Pete Buttigieg	Kamala Harris	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Other	Undecided
	Mar 1–2, 2020	Buttigieg and Klobuchar withdraw from the race
Swayable[262]	Mar 1–2, 2020	949 (LV)	± 5.0%	42%	18%	–	3%	–	–	20%	10%	8%[jz]	–
Data for Progress[263]	Feb 28 – Mar 2, 2020	237 (LV)	± 6.4%	47%	18%	–	–	–	–	22%	12%	2%[ka]	–
	Jan 13, 2020	Booker withdraws from the race
	Dec 3, 2019	Harris withdraws from the race
	Nov 1, 2019	O'Rourke withdraws from the race
SurveyMonkey[264]	July 2–16, 2019	257	± 7.8%	36%	–	2%	5%	13%	1%	15%	9%	10%[kb]	–
Change Research[265]	March 20–23, 2019	1,200	± 2.8%	42%	–	9%	3%	12%	10%	13%	6%	4%[kc]	–
				–	–	14%	4%	16%	17%	27%	12%	9%[kd]	–

The Arkansas Democratic primary was held on March 3, 2020.^[18]

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Michael Bloomberg	Bernie Sanders	Elizabeth Warren	Tulsi Gabbard	Other/ Undecided[a]
270 to Win[266]	March 3, 2020	February 6–March 2, 2020	27.7%	22.3%	18.7%	11.3%	0.5%	19.5%
RealClear Politics[267]	March 3, 2020	Insufficient recent polling to supply an average.
FiveThirtyEight[268]	March 3, 2020	until March 2, 2020[d]	27.5%	21.0%	18.1%	12.5%	0.3%	20.6%
Average			27.6%	21.65%	18.4%	11.9%	0.4%	20.05%
Arkansas primary results (March 3, 2020)			40.5%	16.7%	22.4%	10.0%	0.7%	9.7%

Tabulation of individual polls of the 2020 Arkansas Democratic Primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Bernie Sanders	Elizabeth Warren	Other	Undecided
	Mar 1–2, 2020	Buttigieg and Klobuchar withdraw from the race
Swayable[269]	Mar 1–2, 2020	714 (LV)	± 6.0%	28%	25%	8%	17%	10%	13%[ke]	–
Data for Progress[270]	Feb 28–Mar 2, 2020	300 (LV)	± 5.6%	36%	22%	2%	23%	15%	2%[kf]	–
The Progress Campaign (D)[271][10]	Feb 21–25, 2020	209 (RV)	± 4.9%	17%	17%	18%	19%	12%	6%[kg]	10%[kh]
Hendrix College/Talk Business & Politics[272]	February 6–7, 2020	496 (LV)	± 4.3%	18.5%	19.6%	15.5%	16.4%	8.9%	10.1%[ki]	11%

The California Democratic primary was held on March 3, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Bernie Sanders	Joe Biden	Elizabeth Warren	Michael Bloomberg	Tulsi Gabbard	Other/ Undecided[a]
270 to Win[273]	March 3, 2020	February 20 – March 1, 2020	33.0%	20.0%	14.4%	15.0%	1.2%	16.4%
RealClear Politics[274]	March 3, 2020	February 28 – March 2, 2020	35.0%	23.0%	16.0%	14.0%	1.5%	10.5%[kj]
FiveThirtyEight[275]	March 3, 2020	until March 2, 2020[d]	31.2%	21.7%	14.9%	14.7%	0.7%	16.8%
Average			33.1%	21.6%	15.1%	14.6%	1.1%	14.5%
California primary results (March 3, 2020)			36.0%	27.9%	13.2%	12.1%	0.6%	10.2%

Polling from January 1 to March 3, 2020
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Amy Klobuchar	Bernie Sanders	Tom Steyer	Elizabeth Warren	Andrew Yang	Other	Undecided
	March 2, 2020	Klobuchar withdraws from the race.
Swayable[276]	March 1–2, 2020	3,388 (LV)	± 2.0%	20.8%	19.3%	8.4%	3.3%	28.7%	4.0%	9.6%	–	6.0%[kk]	–
Data for Progress[277]	February 28 – March 2, 2020	516 (LV)	± 4.3%	25%	17%	5%	3%	32%	–	16%	–	1%[kl]	–
AtlasIntel[278]	February 24 – March 2, 2020	727 (LV)	± 4.0%	26%	15%	3%	1%	34%	–	15%	–	2%[km]	4%
	March 1, 2020	Buttigieg withdraws from the race.
Point Blank Political[279]	February 29 – March 1, 2020	1,220 (LV)	± 4.1%	22%	10%	6%	3%	34%	1%	14%	–	1%[kn]	9%
Emerson College/Nexstar[280]	February 29 – March 1, 2020	545 (LV)	± 4.1%	21%	11%	7%	5%	38%	2%	16%	–	1%[ko]	–
	February 29, 2020	South Carolina primary; Steyer withdraws from the race after close of polls.
YouGov/CBS News[281]	February 27–29, 2020	1,411 (LV)	± 4.0%	19%	12%	9%	4%	31%	3%	18%	–	4%[kp]	–
Suffolk University[282]	February 26–29, 2020	500 (LV)	± 4.4%	14%	16%	7%	5%	35%	3%	12%	–	3%[kq]	–
YouGov/[[Hoover Institution/Stanford University]][283]	February 26–28, 2020	1,020 (LV)	–	19%	13%	9%	6%	28%	4%	18%	–	3%[kr]	–
Point Blank Political[284]	February 26–28, 2020	2,276 (LV)	± 2.9%	14%	12%	9%	3%	34%	3%	14%	–	1%[ks]	10%
				40%[kt]	–	–	–	50%	–	–	–	–	11%
				–	32%[ku]	–	–	57%	–	–	–	–	11%
				–	–	–	–	46%[kv]	–	36%	–	–	16%
CNN/SSRS[285]	February 22–26, 2020	488 (LV)	± 5.2%	13%	12%	7%	6%	35%	3%	14%	–	3%[kw]	8%
	February 25, 2020	Tenth Democratic primary debate
Point Blank Political[286]	February 23–25, 2020	2,098 (LV)	± 3.0%	11%	11%	9%	4%	34%	3%	13%	–	2%[kx]	13%
Berkeley IGS/LA Times[287]	Feb 20–25, 2020	3,002 (LV)	± 2.0%	8%	12%	11%	6%	34%	2%	17%	1%	2%[ky]	7%
	February 22, 2020	Nevada caucuses
Change Research/KQED News[288]	February 20–23, 2020	1,069 (LV)	± 3.4%	12%	6%	11%	5%	37%	3%	20%	4%[kz]	3%[la]	–
University of Massachusetts Lowell[289]	February 12–20, 2020	450 (LV)	± 6.7%	13%	12%	12%	7%	24%	2%	16%	–	7%[lb]	6%
Monmouth University[290]	February 16–19, 2020	408 (LV)	± 4.9%	17%	13%	9%	4%	24%	5%	10%	–	3%[lc]	13%
				36%[ld]	–	–	–	44%	–	–	–	15%[le]	5%
				–	31%[lf]	–	–	48%	–	–	–	14%[lg]	6%
				–	–	26%[lh]	–	51%	–	–	–	16%[li]	7%
				–	–	–	24%[lj]	54%	–	–	–	16%[lk]	6%
Public Policy Institute of California[291]	February 7–17, 2020	573 (LV)	± 5.7%	14%	12%	12%	5%	32%	3%	13%	–	2%[ll]	8%
SurveyUSA[292]	February 13–16, 2020	520 (LV)	± 4.8%	15%	21%	12%	6%	25%	3%	9%	–	1%[lm]	9%
YouGov/USC[293]	February 1–15, 2020	–	–	21%	8%	6%	3%	29%	2%	20%	–	2%[ln]	9%[lo]
	February 11, 2020	New Hampshire primary; Yang withdraws from the race after close of polls.
Capitol Weekly[294]	February 6–9, 2020	843 (LV)	–	8%[lp]	8%	15%	7%	25%	4%	19%	5%	6%[lq]	3%[lr]
				11%	13%	14%	5%	29%	3%	16%	4%	5%[ls]	1%[lt]
	February 3, 2020	Iowa Caucuses
Change Research/KQED News[295]	January 25–27, 2020	1,967 (LV)	–	15%	4%	8%	3%	30%	2%	16%	5%	4%[lu]	13%
Berkeley IGS/LA Times[296]	January 15–21, 2020	2,895 (LV)	± 2.5%	15.0%	6.0%	7.2%	4.9%	26.3%	1.8%	19.6%	3.9%	3.6%[lv]	11.7%
SurveyUSA[297]	January 14–16, 2020	565 (LV)	± 5.1%	30%	6%	8%	2%	20%	4%	20%	4%	2%[lw]	4%
	January 13, 2020	Booker withdraws from the race.
Public Policy Institute of California/Mercury News[298]	January 3–12, 2020	530 (LV)	± 6.5%	24%	1%	6%	4%	27%	–	23%	3%	5%[lx]	7%
Tulchin Research/USC Rossier/The Hill[299]	January 3–10, 2020	1,121 (LV)	–	25%	7%	8%	2%	29%	3%	12%	5%	2%[ly]	6%
Capitol Weekly[300]	January 1–9, 2020	1,053 (LV)	–	20%	6%	11%	5%	24%	2%	21%	7%	3%[lz]	–

Polling before 1 January 2020
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Cory Booker	Pete Buttigieg	Kamala Harris	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
Change Research/KQED News[301]	December 6–10, 2019	862 (LV)	± 3.3%	19%	3%	12%	–	–	26%	23%	4%	13%[ma]	–
CNN/SSRS[302]	December 4–8, 2019	508 (LV)	± 5.2%	21%	3%	9%	–	–	20%	17%	6%	12%[mb]	11%
Capitol Weekly[303]	December 3–7, 2019	581 (LV)	–[mc]	19%	2%	14%	–	–	19%	23%	5%	17%[md]	1%
				19%	2%	13%	4%	–	19%	21%	5%	17%[me]	0%
	December 3, 2019	Harris withdraws from the race.
Berkeley IGS/LA Times[304]	November 21–27, 2019	1,252 (LV)	–	14%	1%	12%	7%	–	24%	22%	3%	12%[mf]	9%
SurveyUSA[305]	November 20–22, 2019	558 (LV)	± 4.8%	28%	3%	8%	10%	–	18%	13%	5%	11%[mg]	5%
Capitol Weekly[306]	November 1–12, 2019	695 (LV)	–	18%	1%	14%	6%	–	21%	27%	4%	8%[mh]	1%
[[Public Policy Institute of California]][307]	November 3–12, 2019	682 (LV)	–	24%	1%	7%	8%	–	17%	23%	5%	6%[mi]	9%
	November 1, 2019	O'Rourke withdraws from the race.
Change Research[308]	October 15–18, 2019	1,631 (LV)	–	19%	1%	9%	8%	1%	24%	28%	3%	6%[mj]	–
SurveyUSA[309]	October 15–16, 2019	553 (LV)	± 6.9%	33%	2%	4%	8%	2%	17%	18%	4%	5%[mk]	8%
Capitol Weekly[310]	October 1–14, 2019	590 (LV)	–	21%	2%	6%	8%	0%	15%	35%	3%	9%[ml]	–
[[Public Policy Institute of California]][311]	September 16–25, 2019	692 (LV)	± 4.9%	22%	2%	6%	8%	1%	21%	23%	3%	7%[mm]	9%
Berkeley IGS/LA Times[312]	September 13–18, 2019	2,272	–	20%	1%	6%	8%	3%	19%	29%	2%	5%[mn]	8%
Emerson College[313]	September 13–16, 2019	424	± 4.7%	26%	1%	4%	6%	5%	26%	20%	7%	4%[mo]	–
SurveyUSA[314]	September 13–15, 2019	547	± 4.8%	27%	2%	3%	13%	2%	18%	16%	7%	4%[mp]	7%
Change Research/KQED[315]	September 12–15, 2019	3,325	± 1.7%	18%	2%	10%	11%	2%	23%	25%	3%	5%[mq]	–
Capitol Weekly[316]	September 1–13, 2019	599	–	18%	1%	7%	11%	2%	21%	29%	4%	5%[mr]	–
Capitol Weekly[317]	September 1–13, 2019	5,510	–	18%	1%	8%	11%	2%	17%	33%	3%	7%[ms]	–
SurveyUSA[318]	August 1–5, 2019	528	± 6.3%	25%	1%	6%	17%	0%	18%	21%	1%	1%[mt]	10%
PPIC[319]	July 14–23, 2019	766	± 4.4%	11%	–	5%	19%	–	12%	15%	–	14%[mu]	25%
YouGov/CBS News[320]	July 9–18, 2019	1,514	± 2.9%	24%	1%	6%	23%	1%	16%	19%	1%	9%[mv]	–
Quinnipiac University[321]	July 10–15, 2019	519	± 5.7%	21%	1%	3%	23%	1%	18%	16%	2%	2%[mw]	10%
Capitol Weekly[317]	July 1–15, 2019	816	–	20%	1%	8%	20%	2%	16%	25%	1%	7%[mx]	–
Change Research[322]	July 9–11, 2019	1,609	± 2.5%	17%	1%	8%	23%	2%	20%	22%	2%	5%[my]	–
	July 8, 2019	Swalwell withdraws from the race.
Capitol Weekly[323]	June 1–30, 2019	813	–	23%	2%	8%	14%	2%	19%	23%	2%	9%[mz]	–
UC Berkeley[324]	June 4–10, 2019	2,131	± 3.0%	22%	1%	10%	13%	3%	17%	18%	1%	3%[na]	11%
Capitol Weekly[323]	May 1–31, 2019	1,180	–	29%	2%	9%	17%	4%	22%	11%	0%	6%[nb]	–
Change Research[325]	May 25–28, 2019	1,649	± 2.4%	30%	1%	12%	15%	3%	23%	12%	1%	2%[nc]	–
Capitol Weekly[323]	April 15–30, 2019	1,204	–	20%	2%	19%	17%	4%	20%	10%	–	9%[nd]	–
	April 25, 2019	Biden announces his candidacy.
	April 14, 2019	Buttigieg announces his candidacy.
Change Research[326]	April 6–9, 2019	2,003	± 2.2%	21%	3%	9%	19%	10%	22%	8%	1%	7%[ne]	–
				–	5%	11%	27%	16%	28%	9%	1%	5%[nf]	–
	April 8, 2019	Swalwell announces his candidacy.
Quinnipiac University[327]	April 3–8, 2019	482	± 5.9%	26%	2%	7%	17%	4%	18%	7%	1%	6%[ng]	13%
	March 14, 2019	O'Rourke announces his candidacy.
	February 19, 2019	Sanders announces his candidacy.
Change Research[328]	February 9–11, 2019	948	–	26%	3%	1%	26%	8%	20%	7%	0%	7%[nh]	–
				–	7%	2%	53%	–	–	23%	1%	15%[ni]	–

The Colorado Democratic primary was held on March 3, 2020.^[18]

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Bernie Sanders	Joe Biden	Elizabeth Warren	Michael Bloomberg	Tulsi Gabbard	Un- decided[a]
270 to Win[329]	March 3, 2020	Feb 24–Mar 2, 2020	29.3%	16.3%	16.0%	15.3%	1.0%	22.1%
RealClear Politics[330]	March 3, 2020	Insufficient recent polling to supply an average.
FiveThirtyEight[331]	March 3, 2020	until March 3, 2020[d]	26.8%	18.2%	16.3%	15.8%	0.5%	22.4%
Average			28.0%	17.3%	16.2%	15.6%	0.8%	22.1%
Colorado primary results (March 3, 2020)			37.0%	24.6%	17.6%	18.5%	1.0%	1.3%

Tabulation of individual polls of the 2020 Colorado Democratic Primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Michael Bennet	Joe Biden	Michael Bloomberg	Pete Buttigieg	Kamala Harris	John Hickenlooper	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
	Mar 2, 2020	Klobuchar withdraws from the race
Swayable[332]	Mar 1–2, 2020	921 (LV)	± 4.0%	–	20%	19%	12%	–	–	29%	12%	–	7%[nj]	–
Data for Progress[333]	Feb 28–Mar 2, 2020	464 (LV)	± 4.2%	–	18%	16%	8%	–	–	32%	21%	–	5%[nk]	–
	Mar 1, 2020	Buttigieg withdraws from the race
Elucd[334]	Feb 26–Mar 1, 2020	561 (LV)	± 4.1%	–	10%	9%	10%	–	–	34%	14%	–	9%[nl]	14%
Magellan Strategies[335]	Feb 24–25, 2020	500 (LV)	± 4.38%	–	11%	11%	12%	–	–	27%	15%	–	9%[nm]	15%
Data for Progress[336]	Feb 23–25, 2020	471 (LV)	± 4.7%	–	10%	14%	14%	–	–	34%	20%	–	7%[nn]	1%
	Feb 11, 2020	New Hampshire primary; Yang and Bennet withdraw from the race
	Dec 3, 2019	Harris withdraws from the race
Emerson College[337]	Aug 16–19, 2019	403 (LV)	± 4.8%	1%	25%	–	5%	13%	–	26%	20%	4%	8%[no]	–
	Aug 15, 2019	Hickenlooper withdraws from the race
Public Policy Polling[338]	Jul 12–14, 2019	519 (LV)	–	5%	22%	–	7%	9%	7%	15%	19%	0%	14%[np]	–

The Maine Democratic primary was held on March 3, 2020.^[18]

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Bernie Sanders	Joe Biden	Michael Bloomberg	Elizabeth Warren	Tulsi Gabbard	Undecided[a]
270 to Win[339]	Mar 3, 2020	Feb 10–Mar 2, 2020	28.7%	19.7%	20.0%	13.3%	1.3%	17.0%
RealClear Politics[340]	Mar 3, 2020	Feb 28–Mar 2, 2020	38.5%	24.5%	14.0%	18.0%	–[nq]	5.0%
FiveThirtyEight[341]	Mar 3, 2020	until Mar 2, 2020 [d]	31.1%	21.7%	17.2%	14.2%	0.7%	19.6%
Average			32.8%	22.0%	17.1%	15.2%	1.0%	11.9%
Maine primary results (March 3, 2020)			32.4%	33.4%	11.8%	15.6%	0.9%	5.9%

Tabulation of individual polls of the 2020 Maine Democratic Primary
Poll source	Date(s) administered	Sample size	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Kamala Harris	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
	Mar 2, 2020	Klobuchar withdraws from the race
Swayable[342]	Mar 1–2, 2020	209 (LV)	± 9.0%	22%	28%	10%	–	27%	11%	–	3%[nr]	–
Change Research[343]	Mar 1–2, 2020	507 (LV)	–	24%	10%	–	–	43%	16%	–	7%[ns]	–
Data for Progress[344]	Feb 28–Mar 2, 2020	385 (LV)	± 4.9%	25%	18%	1%	–	34%	20%	–	2%[nt]	–
	Mar 1, 2020	Buttigieg withdraws from the race
SocialSphere/Colby College[345]	Feb 10–13, 2020	350 (LV)	–	12%	14%	16%	–	25%	9%	2%	10%[nu]	12%
	Feb 11, 2020	Yang withdraws from the race
	Dec 3, 2019	Harris withdraws from the race
Maine People's Resource Center[346]	Oct 14–21, 2019	728 (LV)	± 3.63%	26.8%	–	9.1%	5.0%	15.4%	22.1%	1.7%	11.4%[nv]	4.4%
Public Policy Polling[347]	Oct 11–13, 2019	366 (LV)	± 5.1%	19%	–	9%	4%	12%	31%	3%	20%[nw]	–[nx]
Gravis Marketing[348]	Jun 24, 2019	243	± 6.3%	25%	–	8%	2%	15%	17%	5%	15%[ny]	11%

The Massachusetts Democratic primary was held on March 3, 2020.^[18]

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Bernie Sanders	Elizabeth Warren	Joe Biden	Michael Bloomberg	Tulsi Gabbard	Others/ Undecided[nz]
270 to Win[349]	March 3, 2020	Until March 3, 2020	22.4%	21.0%	15.0%	13.6%	1.8%	26.2%
FiveThirtyEight[350]	March 3, 2020	until March 3, 2020 [d]	24.4%	21.0%	18.1%	14.5%	0.4%	21.6%
Average			23.4%	21.0%	16.6%	14.0%	1.1%	23.9%
Massachusetts primary results (March 3, 2020)			26.6%	21.4%	33.4%	11.7%	0.7%	6.1%

Tabulation of individual polls of the 2020 Massachusetts Democratic Primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Cory Booker	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Beto O'Rourke	Deval Patrick	Bernie Sanders	Elizabeth Warren	Other	Undecided
	Mar 2, 2020	Klobuchar withdraws from the race; endorses Biden
Swayable[351]	Mar 1–2, 2020	917 (LV)	± 4.0%	17%	18%	–	11%	–	5%	–	–	27%	15%	8%[oa]	–
Data for Progress[352]	Feb 28–Mar 2, 2020	301 (LV)	± 5.6%	26%	15%	–	2%	–	1%	–	–	26%	28%	2%[ob]	–
	Mar 1, 2020	Buttigieg withdraws from the race; endorses Biden
Suffolk University/Boston Globe/WBZ-TV[353]	Feb 26–29, 2020	500 (LV)	-	11.0%	13.0%	–	12.4%	–	5.0%	–	–	24.2%	22.2%	3.6%[oc]	8.6%
WBUR/MassINC[354]	Feb 23–26, 2020	426 (LV)	± 4.9%	9%	13%	-	14%	-	6%	-	-	25%	17%	9%[od]	8%
UMass Amherst[355]	Feb 18–24, 2020	400 (LV)	± 5.9%	12%	9%	-	14%	-	7%	-	-	25%	23%	8%[oe]	3%
Falchuk & DiNatale[356]	Feb 16–18, 2020	453 (LV)	–	13%	13%	–	13%	–	14%	–	–	17%	16%	5%[of]	8%
University of Massachusetts Lowell[357]	Feb 12–19, 2020	450 (LV)	± 6.1%	14%	12%	–	15%	–	9%	–	–	21%	20%	6%[og]	4%
	Feb 12, 2020	Patrick withdraws from the race
Falchuk & DiNatale[358]	Jan 27–30, 2020	334 (LV)	–	16%	8%	–	6%	–	7%	–	3%	12%	23%	7%[oh]	–
	Jan 13, 2020	Booker withdraws from the race
	Dec 3, 2019	Harris withdraws from the race
	Nov 24, 2019	Bloomberg announces his candidacy
	Nov 14, 2019	Patrick announces his candidacy
	Nov 1, 2019	O'Rourke withdraws from the race
WBUR[359]	Oct 16–20, 2019	456	± 4.6%	18%	–	0%	7%	3%	1%	0%	–	13%	33%	7%[oi]	15%
Suffolk University[360]	Sep 3–5, 2019	500	-	26%	–	1%	5%	3%	0%	1%	–	8%	24%	6%[oj]	25%
	Aug 23, 2019	Moulton withdraws from the race
Suffolk University[361]	Jun 5–9, 2019	370	± 5.1%	22%	–	1%	8%	5%	0%	1%	–	6%	10%	5%[ok]	42%
	Apr 25, 2019	Biden announces his candidacy
	Apr 22, 2019	Moulton announces his candidacy
	Apr 14, 2019	Buttigieg announces his candidacy
Emerson College[362]	Apr 4–7, 2019	371	± 5.0%	23%	–	2%	11%	7%	2%	8%	–	26%	14%	8%[ol]	–
	Mar 14, 2019	O'Rourke announces his candidacy
	Feb 19, 2019	Sanders announces his candidacy
	Feb 10, 2019	Klobuchar announces her candidacy
	Feb 9, 2019	Warren announces her candidacy
	Feb 1, 2019	Booker announces his candidacy
	Jan 21, 2019	Harris announces her candidacy
YouGov/UMass Amherst[363]	Nov 7–14, 2018	655	–	19%	–	3%	–	6%	3%	10%	6%	14%	11%	1%[om]	27%

Hypothetical polling with only Biden, Sanders and Warren
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Bernie Sanders	Elizabeth Warren	Undecided
Evan Falchuk and Lou DiNatalie/Commonwealth Magazine[364]	Oct 23–25, 2019	443 (LV)	–	35%	13%	41%	11%

The Minnesota Democratic primary was held on March 3, 2020.^[18] Amy Klobuchar led in pre-election polling, but withdrew from the race the night before the election and endorsed Joe Biden (who went on to win Minnesota).

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Amy Klobuchar	Bernie Sanders	Elizabeth Warren	Joe Biden	Michael Bloomberg	Tulsi Gabbard	Un- decided[a]
270 to Win[365]	Mar 2, 2020	Feb 20–22, 2020	28.0%	22.0%	13.5%	8.5%	6.0%	2.5%	19.5%
FiveThirtyEight[366]	Mar 2, 2020	until Mar 2, 2020[d]	24.4%	26.2%	14.4%	10.7%	5.6%	1.5%	17.2%
Average			26.2%	24.1%	14.0%	9.6%	5.8%	2.0%	18.3%
Minnesota Primary results (March 3, 2020)			5.6%	29.9%	15.4%	38.6%	8.3%	0.3%	1.8%

Tabulation of individual polls of the 2020 Minnesota Democratic Primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Other	Undecided
	Mar 2, 2020	Klobuchar withdraws from the race
Swayable[367]	Mar 1–2, 2020	1,472 (LV)	± 4.0%	20%	14%	4%	–	21%	–	27%	8%	6%[on]	–
Data for Progress[368]	Feb 28–Mar 2, 2020	650 (LV)	± 3.84%	27%	16%	–	–	2%	–	32%	21%	1%[oo]	–
	Mar 1, 2020	Buttigieg withdraws from the race
Mason-Dixon/Star Tribune/[[ MPR News Minnesota]][369]	Feb 17–20, 2020	500(LV)	± 4.5%	8%	3%	3%	–	29%	–	23%	11%	2%[op]	21%
University of Massachusetts Lowell[370]	Feb 12–19, 2020	450(LV)	± 6.4%	9%	9%	10%	–	27%	–	21%	16%	4%[oq]	4%
	Dec 3, 2019	Harris withdraws from the race
	Nov 1, 2019	O'Rourke withdraws from the race
St. Cloud State University[371]	Oct 14-Nov 1, 2019	177 (LV)	–	15%	–	2%	–	15%	–	12%	15%	–	–
Kaiser Family Foundation[372]	Sep 23–Oct 15, 2019	249	–	14%	–	7%	1%	15%	1%	13%	25%	5%[or]	21%
Change Research[373]	Jun 8–12, 2019	772	± 3.7%	20%	–	11%	4%	16%	3%	19%	21%	5%[os]	–

The North Carolina Democratic primary was held on March 3, 2020.^[18]

Polling Aggregation
Source of poll aggregation	Date Updated	Dates polled	Joe Biden	Bernie Sanders	Michael Bloomberg	Elizabeth Warren	Tulsi Gabbard	Other/ Undecided[a]
270 to Win[374]	March 3, 2020	February 21–March 2, 2020	27.8%	25.8%	17.0%	11.6%	0.8%	17.0%
RealClear Politics[375]	March 3, 2020	February 27–March 2, 2020	36.7%	23.3%	14.3%	10.7%	1.0%	14.0%
FiveThirtyEight[376]	March 3, 2020	until March 2, 2020[d]	34.5%	22.1%	14.4%	11.3%	0.2%	17.5%
Average			33.0%	23.7%	15.2%	11.2%	0.7%	16.2%
North Carolina primary results (March 3, 2020)			43.0%	24.1%	13.0%	10.5%	0.5%	8.9%

Tabulation of individual polls of the 2020 North Carolina Democratic primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Cory Booker	Pete Buttigieg	Kamala Harris	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
	Mar 2, 2020	Klobuchar withdraws from the race
Spry Strategies/Civitas[377]	Mar 1–2, 2020	543 (LV)	± 4.2%	45%	11%	–	3%	–	18%	7%	–	6%[ot]	11%
Swayable[378]	Mar 1–2, 2020	1,209 (LV)	± 3.0%	36%	18%	–	4%	–	23%	10%	–	10%[ou]	–
Data for Progress[379]	Feb 28–Mar 2, 2020	334 (LV)	± 5.3%	36%	18%	–	3%	–	27%	14%	–	3%[ov]	–
	Mar 1, 2020	Buttigieg withdraws from the race
Elucd[380]	Feb 26–Mar 1, 2020	657 (LV)	± 3.8%	25%	15%	–	6%	–	26%	12%	–	6%[ow]	10%
East Carolina University[381]	Feb 27–28, 2020	499 (LV)	± 5.1%	29%	14%	–	4%	–	25%	11%	–	9%[ox]	9%
High Point University[382]	Feb 21–28, 2020	274 (LV)	–	14%	20%	–	8%	–	28%	12%	–	13%[oy]	7%
		472 (RV)	–	14%	18%	–	8%	–	31%	11%	–	11%[oz]	7%
Spry Strategies/Civitas[383]	Feb 26–27, 2020	581 (LV)	± 4.1%	27%	16%	–	4%	–	19%	11%	–	10%[pa]	15%
Marist College[384]	Feb 23–27, 2020	568 (LV)	± 5.1%	24%	15%	–	7%	–	26%	11%	–	8%[pb]	7%
		974 (RV)	± 3.9%	22%	15%	–	7%	–	27%	11%	–	9%[pc]	8%
Data for Progress[385]	Feb 23–27, 2020	536 (LV)	± 4.2%	25%	18%	–	10%	–	27%	11%	–	8%[pd]	–
Public Policy Polling[386]	Feb 23–24, 2020	852 (LV)	± 3.4%	23%	17%	–	9%	–	20%	11%	–	8%[pe]	11%[pf]
Meredith College[387]	Feb 16–24, 2020	430 (LV)	–	17.9%	17.0%	0.7%	10.0%	–	19.5%	10.9%	–	7.6%[pg]	16.5%[ph]
Spry Strategies/Civitas[388]	Feb 21–23, 2020	561 (LV)	± 3.75%	20%	20%	–	3%	–	20%	9%	–	13%[pi]	14%
University of Massachusetts Lowell[389]	Feb 12–18, 2020	450 (LV)	± 6.5%	16%	19%	–	10%	–	23%	13%	–	13%[pj]	6%
SurveyUSA/WRAL News[390]	Feb 13–16, 2020	698 (LV)	± 5.0%	20%	22%	–	11%	–	22%	8%	–	7%[pk]	11%
	Feb 11, 2020	New Hampshire primary; Yang withdraws from the race after close of polls
High Point University[391]	Jan 31–Feb 6, 2020	225 (LV)	–	24%	16%	0%	8%	–	20%	11%	3%	9%[pl]	8%
		399 (RV)	–	19%	13%	1%	6%	–	25%	12%	4%	8%[pm]	12%
Public Policy Polling[392]	Feb 4–5, 2020	604 (LV)	–	25%	14%	–	9%	–	16%	12%	5%	7%[pn]	13%[po]
	Jan 13, 2020	Booker withdraws from the race
Public Policy Polling[393]	Jan 10–12, 2020	509 (LV)	–	31%	8%	1%	6%	–	18%	15%	5%	6%[pp]	11%[pq]
	Dec 3, 2019	Harris withdraws from the race
	Nov 24, 2019	Bloomberg launches his campaign
Fox News[394]	Nov 10–13, 2019	669	± 3.5%	37%	–	2%	6%	4%	14%	15%	2%	8%[pr]	10%
HighPoint University[395]	Nov 1–7, 2019	347[ps]	± 6.4%	33%	–	2%	4%	5%	18%	13%	2%	6%[pt]	10%
		1,049[pu]	± 3.6%	18%	–	2%	4%	4%	15%	7%	2%	7%[pv]	23%
Siena Research/New York Times[396]	Oct 13–26, 2019	324	–	29%	–	1%	1%	1%	13%	15%	0%	3%[pw]	32%
High Point University[397]	Sep 13–19, 2019	348 (A)	–	31%	–	4%	3%	6%	20%	15%	4%	3%[px]	9%
SurveyUSA/Civitas[398]	Aug 1–5, 2019	534	± 6.1%	36%	–	1%	5%	8%	15%	13%	1%	2%[py]	17%
Emerson College[399]	May 31 – Jun 3, 2019	397	± 4.9%	39%	–	1%	8%	5%	22%	15%	1%	7%[pz]	–

The Oklahoma Democratic primary was held on March 3, 2020.^[18]

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Michael Bloomberg	Elizabeth Warren	Tulsi Gabbard	Other/ Undecided[a]
270 to Win[400]	March 3, 2020	February 17–March 2, 2020	28.0%	23.7%	16.0%	12.3%	1.5%	18.5%
RealClear Politics[401]	March 3, 2020	Insufficient recent polling to supply an average.
FiveThirtyEight[402]	March 3, 2020	until March 2, 2020[d]	30.6%	22.1%	13.7%	13.6%	1.1%	18.9%
Average			29.3%	22.9%	14.85%	12.95%	1.3%	18.7%
Oklahoma primary results (March 3, 2020)			38.7%	25.4%	13.9%	13.4%	1.7%	6.9%

Tabulation of individual polls of the 2020 Oklahoma Democratic primary
Poll source	Date(s) administered	Sample size	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Bernie Sanders	Elizabeth Warren	Other	Undecided
	Mar 1–2, 2020	Buttigieg and Klobuchar withdraw from the race
Swayable[403]	Mar 1–2, 2020	472 (LV)	± 6.0%	38%	11%	1%	–	1%	26%	13%	9%[qa]	–
Data for Progress[404]	Feb 28–Mar 2, 2020	300 (LV)	± 5.5%	35%	19%	–	–	–	28%	16%	2%[qb]	–
SoonerPoll[405]	Feb 17–21, 2020	409	4.84%	21%	20%	10%	–	7%	13%	9%	2%[qc]	19%
Cole Hargrave Snodgrass & Associated[406]	Feb 10–13, 2020	172 (LV)	–	12%	20%	1%	–	6%	14%	8%	21%[qd]	9%
	Dec 3, 2019	Harris withdraws from the race
SoonerPoll[407]	Jul 17–27, 2019	152	–	26%	–	6%	8%	1%	5%	12%	11%[qe]	34%

The Tennessee Democratic primary was held on March 3, 2020.^[18]

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Michael Bloomberg	Elizabeth Warren	Tulsi Gabbard	Other/ Undecided[a]
270 to Win[408]	March 3, 2020	February 28–March 2, 2020	31.0%	27.0%	18.5%	12.0%	0.5%	11.0%
RealClear Politics[409]	March 3, 2020	Insufficient recent polling to supply an average.
FiveThirtyEight[410]	March 3, 2020	until March 2, 2020[d]	29.0%	24.7%	15.7%	12.3%	0.2%	18.1%
Average			30.0%	25.85%	17.1%	12.15%	0.35%	14.55%
Tennessee primary results (March 3, 2020)			41.7%	25.0%	15.5%	10.4%	0.4%	7.0%

Tabulation of individual polls of the 2020 Tennessee Democratic Primary
Poll source	Date(s) administered	Sample size	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Kamala Harris	Bernie Sanders	Elizabeth Warren	Other	Undecided
	Mar 1–2, 2020	Buttigieg and Klobuchar withdraw from the race
Swayable[411]	Mar 1–2, 2020	1,527 (LV)	± 4.0%	28%	17%	8%	–	27%	9%	11%[qf]	–
Data for Progress[412]	Feb 28–Mar 2, 2020	368 (LV)	± 5.1%	34%	20%	2%	–	27%	15%	3%[qg]	–
	Dec 3, 2019	Harris withdraws from the race
SurveyMonkey[413]	Jul 2–16, 2019	128	± 11.2%	33%	–	6%	12%	13%	18%	11%[qh]	–

The Texas Democratic primary was held on March 3, 2020.^[18]

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Bernie Sanders	Joe Biden	Michael Bloomberg	Elizabeth Warren	Tulsi Gabbard	Other/ Undecided[a]
270 to Win[414]	Mar 2, 2020	Feb 17-Mar 1, 2020	30.2%	25.6%	16.8%	13.6%	1.0%	12.8%
RealClear Politics[415]	Mar 2, 2020	Feb 27-Mar 1, 2020	29.5%	28.0%	18.0%	14.5%	2.0%	8.0%
FiveThirtyEight[416]	March 3, 2020	until March 2, 2020 [d]	28.2%	25.5%	16.5%	13.3%	0.4%	16.1%
Average			29.0%	26.5%	17.1%	13.8%	0.9%	12.6%
Texas primary results (March 3, 2020)			30.0%	34.5%	14.4%	11.4%	0.4%	9.3%

Polling from January 1, 2020, to March 3, 2020
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Amy Klobuchar	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
	Mar 2, 2020	Klobuchar withdraws from the race
Swayable[417]	Mar 1–2, 2020	1,378 (LV)	± 3.0%	27%	20%	5%	3%	28%	12%	–	6%[qi]	–
Data for Progress[418]	Feb 28–Mar 2, 2020	300 (LV)	± 5.7%	30%	20%	4%	3%	28%	15%	–	1%[qj]	–
AtlasIntel[419]	Feb 24-Mar 2, 2020	486 (LV)	± 4.0%	25%	16%	5%	3%	35%	9%	–	3%[qk]	4%
	Mar 1, 2020	Buttigieg withdraws from the race
Emerson College/Nexstar[420]	Feb 29-Mar 1, 2020	450 (LV)	± 4.6%	26%	16%	5%	4%	31%	14%	–	5%[ql]	–
Elucd[421]	Feb 26-Mar 1, 2020	833 (LV)	± 3.4%	20%	14%	7%	5%	31%	13%	–	–	11%
YouGov/CBS News[422]	Feb 27–29, 2020	635 (LV)	± 6.2%	26%	13%	6%	6%	30%	17%	–	2%[qm]	–
Marist College[423]	Feb 23–27, 2020	556 (LV)	± 5.3%	19%	15%	8%	3%	34%	10%	–	2%[qn]	9%
		1,050 (RV)	± 3.7%	18%	16%	8%	3%	35%	8%	–	3%[qo]	9%
Data for Progress[424]	Feb 23–27, 2020	513 (LV)	± 4.3%	21%	21%	9%	5%	30%	13%	–	2%[qp]	–
CNN/SSRS[425]	Feb 22–26, 2020	387 (LV)	± 6.0%	20%	18%	8%	3%	29%	15%	–	0%	5%[qq]
Latino Decisions/Univision/ University of Houston[426]	Feb 21–26, 2020	527 (LV)	± 4.3%	20%	20%	6%	2%	26%	11%	–	7%[qr]	6%
University of Texas at Tyler[427]	Feb 17–26, 2020	586 (LV)	± 4.1%	19%	21%	8%	4%	29%	10%	–	2%[qs]	5%
Public Policy Polling/Progress Texas[428]	Feb 24–25, 2020	1,045 (LV)	± 3.0%	31%	–[qt]	11%	7%	25%	17%	–	4%[qu]	5%[qv]
				24%	17%	10%	4%	24%	14%	–	2%[qw]	5%[qx]
	Feb 22, 2020	Nevada caucuses
University of Massachusetts Lowell[429]	Feb 12–18, 2020	600 (LV)	± 5.9%	20%	18%	7%	9%	23%	14%	–	6%[qy]	3%
YouGov/University of Houston[430]	Feb 6–18, 2020	1,352 (LV)	± 2.7%	20%	12%	11%	7%	20%	17%	–	8%[qz]	5%
	Feb 11, 2020	New Hampshire primary; Yang withdraws from the race
YouGov/University of Texas/Texas Tribune[431]	Jan 31-Feb 9, 2020	575 (LV)	± 4.09%	22%	10%	7%	3%	24%	15%	6%	13%[ra]	–
University of Texas At Tyler/Dallas News[432]	Jan 21–30, 2020	372 (LV)	± 4.8%	34%	16%	4%	3%	18%	17%	3%	5%[rb]	–
Data for Progress[433][11][A]	Jan 16–21, 2020	615 (LV)	± 6.5%	26%	7%	10%	4%	20%	14%	3%	3%[rc]	12%
Texas Lyceum[434][permanent dead link]	Jan 10–19, 2020	401 (LV)	± 4.89%	28%	9%	6%	4%	26%	13%	0%	5%[rd]	7%
	Jan 13, 2020	Booker withdraws from the race
	Jan 2, 2020	Castro withdraws from the race

Polling before January 2020
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Cory Booker	Pete Buttigieg	Julian Castro	Kamala Harris	Amy Klobuchar	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
CNN/SSRS[435]	Dec 4–8, 2019	327 (LV)	± 6.6%	35%	2%	9%	3%	–	1%	–	15%	13%	3%	11%[re]	9%
	Dec 3, 2019	Harris withdraws from the race
	Nov 24, 2019	Bloomberg announces his candidacy
University of Texas at Tyler[436]	Nov 5–14, 2019	427 (RV)	± 4.7%	28%	1%	8%	3%	5%	2%	–	18%	19%	2%	4%[rf]	–
	Nov 1, 2019	O'Rourke withdraws from the race
University of Texas/ Texas Tribune[437]	Oct 18–27, 2019	541	± 4.2%	23%	1%	6%	2%	5%	2%	14%	12%	18%	4%	4%[rg]	5%
University of Texas at Tyler[438]	Sep 13–15, 2019	474 (RV)	± 4.5%	28%	6%	4%	4%	6%	0%	19%	17%	11%	1%	5%[rh]	–
Texas Tribune[439]	Aug 29–Sep 15, 2019	550	± 4.2%	26%	1%	4%	3%	5%	1%	14%	12%	18%	3%	4%[ri]	6%
Quinnipiac University[440]	Sep 4–9, 2019	456	± 5.5%	28%	1%	3%	3%	5%	2%	12%	12%	18%	1	1%[rj]	12%
Univision/University of Houston[441]	Aug 31– Sep 6, 2019	1004 (RV)	± 4.5%	20%	3%	1%	12%	5%	–	19%	13%	12%	1%	4%[rk]	10%
Ragnar Research[442]	Sep 3–5, 2019	600	± 3.9%	23%	1%	6%	2%	7%	–	12%	12%	15%	–[rl]	7%[rm]	18%
Climate Nexus[443]	Aug 20–25, 2019	639	–	24%	2%	3%	3%	7%	–	21%	12%	12%	1%	5%[rn]	9%
TEXAS LYCEUM[444]	Aug 16–25, 2019	358	± 5.2%	24%	2%	3%	4%	4%	3%	18%	13%	15%	2%	8%[ro]	2%
Emerson College[445]	Aug 1–3, 2019	400	± 4.9%	28%	2%	7%	2%	5%	<1%	19%	16%	14%	3%	5%[rp]	–
YouGov/CBS News[446]	Jul 9–18, 2019	910	± 4.2%	27%	0%	4%	4%	12%	1%	17%	12%	16%	1%	6%[rq]	–
YouGov/University of Texas[447]	May 31 – Jun 9, 2019	483	± 5.0%	23%	1%	8%	3%	5%	1%	15%	12%	14%	0%	8%[rr]	7%
Quinnipiac University[448]	May 29 – Jun 4, 2019	407	± 5.8%	30%	1%	3%	4%	4%	<1%	16%	15%	11%	1%	5%[rs]	8%
Change Research[449]	May 30 – Jun 3, 2019	1,218	± 2.8%	24%	1%	8%	2%	8%	1%	27%	13%	12%	1%	2%[rt]	–
Emerson College[450]	Apr 25–28, 2019	342	± 5.3%	23%	1%	8%	4%	3%	3%	22%	17%	7%	3%	11%[ru]	–
	Apr 25, 2019	Biden announces his candidacy
Change Research[451]	Apr 18–22, 2019	1,578	± 2.5%	20%	2%	15%	4%	5%	1%	25%	19%	5%	1%	2%[rv]	–
				–	4%	21%	5%	8%	1%	33%	23%	5%	0%	0%[rw]	–

The Utah Democratic primary was held on March 3, 2020.^[18]

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Bernie Sanders	Joe Biden	Michael Bloomberg	Elizabeth Warren	Tulsi Gabbard	Other/ Undecided[a]
270 to Win[452]	March 3, 2020	Feb 22–March 2, 2020	26.3%	21.7%	18.7%	13.3%	1.5%	20.0%
FiveThirtyEight[453]	March 3, 2020	Until March 2, 2020[d]	26.3%	20.0%	18.2%	14.6%	1.3%	20.9%
Average			26.3%	20.9%	18.5%	14.0%	1.4%	20.5%
Utah primary results (March 3, 2020)			36.1%	18.4%	15.4%	16.2%	0.8%	13.0%

Tabulation of individual polls of the 2020 Utah Democratic Primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Amy Klobuchar	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
	Mar 2, 2020	Klobuchar withdraws from the race
Swayable[454]	Mar 1–2, 2020	143 (LV)	± 9.0%	27%	29%	7%	6%	22%	6%	–	2%[rx]	–
Data for Progress[455]	Feb 28–Mar 2, 2020	622 (LV)	± 3.9%	23%	17%	7%	3%	29%	19%	–	2%[ry]	–
	Mar 1, 2020	Buttigieg withdraws from the race
HarrisX/University of Utah/Deseret News[456]	Feb 22–26, 2020	298 (LV)	± 5.7%	6%	19%	18%	4%	28%	15%	–	1%[rz]	8%
	Feb 11, 2020	New Hampshire primary; Yang withdraws from the race
Salt Lake Tribune/Suffolk[457]	Jan 18–22, 2020	132 (LV)	± 8.5%	12%	10%	5%	3%	27%	14%	5%	4%[sa]	21%

The Vermont Democratic primary was held on March 3, 2020.^[18]

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Bernie Sanders	Elizabeth Warren	Joe Biden	Michael Bloomberg	Tulsi Gabbard	Other/ Undecided[a]
270 to Win[458]	March 3, 2020	February 4–March 2, 2020	52.0%	14.0%	10.7%	10.3%	1.0%	12.0%
RealClear Politics[459]	March 3, 2020	Insufficient recent polling to supply an average.
FiveThirtyEight[460]	March 3, 2020	until March 2, 2020[d]	53.0%	14.2%	10.4%	8.9%	0.9%	12.6%
Average			52.5%	14.1%	10.55%	9.6%	0.95%	12.3%
Vermont primary results (March 3, 2020)			50.6%	12.5%	21.9%	9.4%	0.8%	4.8%

Tabulation of individual polls of the 2020 Vermont Democratic Primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Amy Klobuchar	Bernie Sanders	Elizabeth Warren	Other	Un- decided
	Mar 2, 2020	Klobuchar withdraws from the race
Swayable[461]	Mar 1–2, 2020	147 (LV)	± 11.0%	11%	16%	5%	2%	48%	17%	2%[sb]	–
Data for Progress[462]	Feb 28–Mar 2, 2020	236 (LV)	± 6.9%	16%	8%	1%	–	57%	16%	2%[sc]	–
	Mar 1, 2020	Buttigieg withdraws from the race
Vermont Public Radio[463]	Feb 4–10, 2020	332 (LV)	± 4.0%	5%	7%	9%	4%	51%	13%	2%[sd]	7%

The Virginia Democratic primary was held on March 3, 2020.^[18]

Polling Aggregation
Source of poll aggregation	Date updated	Dates Polled	Joe Biden	Bernie Sanders	Michael Bloomberg	Elizabeth Warren	Tulsi Gabbard	Un- decided[a]
270 to Win[464]	March 3, 2020	Until March 3, 2020	28.8%	20.0%	17.3%	10.3%	0.7%	23.9%[se]
RealClear Politics[465]	March 3, 2020	Until March 3, 2020	44.0%	24.5%	14.0%	15.0%	0.0%	2.5%
FiveThirtyEight[466]	Mar 3, 2020	until Mar 3, 2020 [d]	39.9%	21.0%	13.2%	12.3%	0.5%	13.1%
Average			37.6%	21.8%	14.1%	12.5%	0.4%	13.2%
Virginia primary results (March 3, 2020)			53.3%	23.1%	9.7%	10.8%	0.9%	2.2%

Tabulation of individual polls of the 2020 Virginia Democratic Primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Cory Booker	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Other	Un- decided
	Mar 2, 2020	Klobuchar withdraws from the race
Swayable[467]	Mar 1–2, 2020	1,435 (LV)	± 4.0%	36%	20%	–	4%	–	3%	–	20%	11%	6%[sf]	–
AtlasIntel[468]	Mar 1–2, 2020	545 (LV)	± 4.0%	42%	11%	–	1%	–	1%	–	28%	10%	3%[sg]	4%
Change Research[469]	Mar 1–2, 2020	510 (LV)	–	45%	10%	–	–	–	4%	–	25%	13%	3%[sh]	–
Data for Progress[470]	Feb 28–Mar 2, 2020	327 (LV)	± 5.4%	39%	18%	–	–	–	–	–	24%	17%	1%[si]	–
	Mar 1, 2020	Buttigieg withdraws from the race
Data for Progress[471]	Feb 23 – 25, 2020	499 (LV)	± 4.5%	19%	17%	–	12%	–	5%	–	28%	17%	2%[sj]	–
Monmouth University[472]	Feb 13 – 16, 2020	400 (LV)	± 4.9%	18%	22%	–	11%	–	9%	–	22%	5%	1%[sk]	11%
				51%[sl]	–	–	–	–	–	–	38%	–	4%[sm]	7%
				–	47%[sn]	–	–	–	–	–	41%	–	5%[so]	7%
				–	–	–	42%[sp]	–	–	–	44%	–	7%[sq]	7%
				–	–	–	–	–	42%[sr]	–	45%	–	6%[ss]	7%
Christopher Newport University[473]	Feb 3 – 23, 2020	561 (LV)	± 4.3%	22%	13%	–	8%	–	5%	–	17%	8%	6%[st]	16%[su]
	Jan 13, 2020	Booker withdraws from the race
	Dec 3, 2019	Harris withdraws from the race
	Nov 24, 2019	Bloomberg announces his candidacy
	Nov 1, 2019	O'Rourke withdraws from the race
University of Mary Washington[474]	Sep 3 – 15, 2019	882 (RV)	± 3.3%	23%	–	1%	4%	5%	2%	1%	9%	9%	46%[sv]	–
Hampton University[475]	May 29 – Jun 6, 2019	1,126 (RV)	± 4.3%	36%	–	2%	11%	7%	<1%	3%	17%	13%	10%[sw]	–
Change Research[476]	Apr 26–30, 2019	551 (LV)	± 4.2%	41%	–	3%	12%	5%	1%	4%	20%	10%	5%[sx]	–

The Idaho Democratic primary is scheduled to take place on March 10, 2020.^[18]

Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Tulsi Gabbard	Bernie Sanders	Other	Undecided
Swayable[477]	Mar 8–9, 2020	833 (LV)	± 7%	52%	2%	37%	9%	–
Data for Progress[478]	Mar 7–9, 2020	329 (LV)	± 5.4%	51%	2%	47%	–	–

The Michigan Democratic primary is scheduled to take place on March 10, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Tulsi Gabbard	Other/ Undecided[sy]
270 to Win[479]	Mar 10, 2020	Mar 4–9, 2020	57.0%	32.3%	1.3%	9.4%
RealClear Politics[480]	Mar 10, 2020	Mar 4–9, 2020	55.7%	33.3%	1.3%	9.7%
FiveThirtyEight[481]	Mar 10, 2020	until Mar 9, 2020[sz]	55.3%	31.9%	1.2%	11.6%
Average			56.0%	32.5%	1.3%	10.2%
Michigan primary results (March 10, 2020)			52.9%	36.4%	0.6%	10.1%

Tabulation of individual polls of the 2020 Michigan Democratic primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Cory Booker	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
Swayable[482]	Mar 9, 2020	3,126 (LV)	± 3.0%	62%	–	–	–	–	–	–	28%	–	–	10%[ta]	–
AtlasIntel[483]	Mar 7–9, 2020	528 (LV)	± 4.0%	48%	3%	–	–	–	–	–	40%	1%	–	3%[tb]	5%
Data for Progress[484]	Mar 7–9, 2020	320 (LV)	± 5.5%	59%	–	–	–	–	–	–	38%	–	–	2%[tc]	–
Mitchell Research & Communications[485]	Mar 8, 2020	602 (LV)	± 4.0%	54%	1%	–	1%	–	1%	–	33%	3%	–	3%[td]	5%
Target Insyght[486]	Mar 8, 2020	600 (LV)	± 4.0%	65%	2%	–	–	–	1%	–	24%	3%	–	3%[te]	1%
Concord Public Opinion Partners/[[ The Welcome Party]][487]	Mar 7–8, 2020	305 (LV)	–	54%	–	–	–	–	–	–	23%	–	–	1%[tf]	22%
YouGov/Yahoo News[488]	Mar 6–8, 2020	–(RV)[tg]	± 5.8%	54%	–	–	–	–	–	–	42%	–	–	–	–
Monmouth University[489]	Mar 5–8, 2020	411 (LV)	± 4.8%	51%	3%	–	<1%	–	<1%	–	36%	1%	–	7%[th]	2%
ROI Rocket[490]	Mar 4–8, 2020	1,000 (LV)	± 3.1%	55%	–	–	–	–	–	–	45%	–	–	–	–
The Progress Campaign (D)[491][12]	Mar 3–7, 2020	417 (RV)	± 4.7%	51%	–	–	–	–	–	–	44%	–	–	1%	4%[ti]
EPIC-MRA/Detroit Free Press[492]	Mar 4–6, 2020	400 (LV)	± 4.9%	51%	–	–	–	–	–	–	27%	–	–	9%[tj]	13%[tk]
	Mar 5, 2020	Warren withdraws from the race
	Mar 4, 2020	Bloomberg withdraws from the race
	Mar 2, 2020	Klobuchar withdraws from the race
	Mar 1, 2020	Buttigieg withdraws from the race
GlenGariff Group Inc./Detroit News/WDIV-TV[493]	Feb 28 – Mar 2, 2020	600 (LV)	± 4.0%	29%	11%	–	6%	–	3%	–	23%	7%	–	6%[tl]	16%
	Feb 29, 2020	South Carolina primary; Steyer withdraws from the race after close of polls
YouGov/University of Wisconsin-Madison[494]	Feb 11–20, 2020	662 (LV)	–	16%	13%	–	11%	–	8%	–	25%	13%	–	–	14%[tm]
	Feb 11, 2020	New Hampshire primary; Yang withdraws from the race after close of polls
Baldwin Wallace University/[[Oakland University]]/Ohio Northern University[495]	Jan 8–20, 2020	477 (RV)	–	27%	9.1%	–	6.3%	–	1.9%	–	21.6%	13.6%	3.5%	5.3%[tn]	10.6%
	Jan 13, 2020	Booker withdraws from the race
	Dec 3, 2019	Harris withdraws from the race
	Nov 24, 2019	Bloomberg announces his candidacy
Emerson College[496]	Oct 31 – Nov 3, 2019	454	± 4.6%	34%	–	3%	8%	3%	0%	–	28%	19%	2%	3%[to]	–
	Nov 1, 2019	O'Rourke withdraws from the race
Siena Research/New York Times[497]	Oct 13–26, 2019	203	–	30%	–	0%	3%	0%	1%	0%	17%	21%	1%	1%[tp]	23%
Kaiser Family Foundation[498]	Sep 23 – Oct 15, 2019	208 (LV)	–	19%	–	1%	7%	2%	1%	1%	15%	25%	1%	0%[tq]	27%
Denno Research[499]	Sep 21–24, 2019	217	–	27%	–	1%	4%	4%	1%	1%	12%	23%	1%	4%[tr]	23%[ts]
Climate Nexus[500]	Jul 14–17, 2019	324 (LV)	–	35%	–	2%	4%	8%	1%	1%	16%	14%	1%	2%[tt]	13%[tu]
Zogby Analytics[501]	May 23–29, 2019	268	± 6.0%	27%	–	1%	9%	7%	1%	4%	18%	8%	2%	5%[tv]	–
Denno Research[502]	May 8–10, 2019	235	–	37%	–	3%	5%	4%	1%	1%	16%	9%	0%	4%[tw]	23%
	Apr 25, 2019	Biden announces his candidacy
	Apr 14, 2019	Buttigieg announces his candidacy
	Mar 14, 2019	O'Rourke announces his candidacy
Emerson College[503]	Mar 7–10, 2019	317	± 5.5%	40%	–	3%	0%	12%	5%	2%	23%	11%	–	4%[tx]	–

The Mississippi Democratic primary is scheduled to take place on March 10, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Tulsi Gabbard	Other/ Undecided[a]
270toWin[504]	March 10, 2020	March 4–9, 2020	72.5%	25.0%	0.5%	2.0%
FiveThirtyEight[505]	March 10, 2020	until March 9, 2020[d]	70.7%	23.4%	0.4%	5.5%
Average			71.6%	24.2%	0.5%	3.7%
Mississippi primary results (March 10, 2020)			81.1%	14.8%	0.4%	3.7%

Tabulation of individual polls of the 2020 Mississippi Democratic primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Cory Booker	Pete Buttigieg	Kamala Harris	Bernie Sanders	Elizabeth Warren	Other	Undecided
Swayable[506]	Mar 8–9, 2020	1,247 (LV)	± 4.0%	68%	–	–	–	28%	–	4%[ty]	–
Data for Progress[507]	Mar 4–7, 2020	340 (LV)	± 5.1%	77%	–	–	–	22%	–	1%[tz]	–
	Mar 5, 2020	Warren withdraws from the race
	Mar 4, 2020	Bloomberg withdraws from the race
	Mar 2, 2020	Klobuchar withdraws from the race
	Mar 1, 2020	Buttigieg withdraws from the race
	Jan 13, 2020	Booker withdraws from the race
	Dec 3, 2019	Harris withdraws from the race
NBC News/SurveyMonkey[508]	Jul 2–16, 2019	282 (RV)	± 4.2%	47%	3%	3%	8%	21%	7%	5%[ua]	3%
Chism Strategies/Millsaps College[509]	Jun 20–21, 2019	523 (LV)	± 4.3%	50%	2%	2%	5%	7%	7%	6%[ub]	21%

The Missouri Democratic primary is scheduled to take place on March 10, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Tulsi Gabbard	Other/ Undecided[a]
270 to Win[510]	March 10, 2020	March 4–9, 2020	57.6%	34.4%	2.7%	5.3%
RealClear Politics[511]	March 10, 2020	March 4–9, 2020	61.0%	30.7%	2.5%	5.8%
FiveThirtyEight[512]	March 10, 2020	until March 9, 2020[d]	60.3%	32.6%	2.5%	4.6%
Average			59.6%	32.6%	2.6%	5.2%
Missouri primary results (March 10, 2020)			60.1%	34.6%	0.7%	4.6%

Tabulation of individual polls of the 2020 Missouri Democratic primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Other	Undecided
Swayable[513]	Mar 9, 2020	2,037 (LV)	± 3.0%	57%	–	–	–	–	–	36%	–	8%[uc]	–
Øptimus[514]	Mar 7–9, 2020	402 (LV)	± 5.4%	68%	–	–	–	–	–	29%	–	3%[ud]	–
Data for Progress[515]	Mar 4–7, 2020	348 (LV)	± 5.3%	62%	–	–	–	–	–	32%	4%	2%[ue]	–
	Mar 5, 2020	Warren withdraws from the race
Remington Research Group/Missouri Scout[516]	Mar 4–5, 2020	1,040 (LV)	± 3.0%	53%	–	–	–	–	–	31%	–	10%[uf]	6%
Emerson Polling/Nexstar[517]	Mar 4–5, 2020	425 (LV)	± 4.7%	48%	–	–	–	–	–	44%	–	8%[ug]	<6%
	Mar 4, 2020	Bloomberg withdraws from the race
	Mar 2, 2020	Klobuchar withdraws from the race
	Mar 1, 2020	Buttigieg withdraws from the race
The Progress Campaign (D)[518][13]	Feb 16–23, 2020	294 (RV)	± 5.1%	29%	14%	13%	–	4%	–	23%	12%	4%[uh]	–
Americana Analytics[519]	Feb 20–21, 2020	1,198 (LV)	± 2.83%	22%	17%	11%	–	9%	–	11%	10%	1%[ui]	17%
Remington Research Group[520]	Jan 22–23, 2020	1,460 (LV)	–	39%	14%	6%	–	8%	–	7%	9%	3%[uj]	14%
	Dec 3, 2019	Harris withdraws from the race
	Nov 1, 2019	O'Rourke withdraws from the race
Show Me Victories[521]	Sept 13–16, 2019	400	± 5%	34%	–	10%	9%	1%	4%	14%	22%	8%[uk]	–
Remington Research Group[522]	Jul 10–11, 2019	1,122	–	43%	–	5%	13%	–	1%	4%	15%	–	19%

The North Dakota Democratic caucus is scheduled to take place on March 10, 2020.^[18]

Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Tulsi Gabbard	Bernie Sanders	Other	Undecided
Swayable[523]	Mar 7–9, 2020	383 (LV)	± 9%	65%	0%	31%	4%	–

The Washington Democratic primary is scheduled to take place on March 10, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Tulsi Gabbard	Un- decided[ul]
270 to Win[524]	Mar 10, 2020	Feb 15 – Mar 9, 2020	33.5%	34.0%	1.3%	34.7%
RealClear Politics[525]	Mar 9, 2020	No averages at this time
FiveThirtyEight[526]	Mar 10, 2020	until Mar 9, 2020[d]	39.8%	37.1%	1.4%	21.7%
Average			36.65%	36.55%	1.35%	28.2%

Tabulation of individual polls of the 2020 Washington Democratic primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Kamala Harris	Jay Inslee	Amy Klobuchar	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
Swayable[527]	Mar 9, 2020	1,840 (LV)	± 3.0%	39%	–	–	–	–	–	37%	–	–	25%[um]	–
Data for Progress[528]	Mar 7–9, 2020	497 (LV)	± 5.1%	49%	–	–	–	–	–	43%	6%	–	2%[un]	–
Survey USA/KING-TV[529]	Mar 4–6, 2020	550 (LV)	± 5.4%	36%	–	–	–	–	–	35%	10%	–	13%[uo]	5%
	Mar 5, 2020	Warren withdraws from the race
Data for Progress[530]	Mar 4–5, 2020	737 (LV)	± 3.6%	47%	–	–	–	–	–	44%	5%[up]	–	3%[uq]	–
	Mar 4, 2020	Bloomberg withdraws from the race
	Mar 2, 2020	Klobuchar withdraws from the race
	Mar 1, 2020	Buttigieg withdraws from the race
Elway Research/Cascade Public Media[531]	Feb 15–18, 2020	404 (LV)	± 5.0%	10%	15%	9%	–	–	11%	21%	11%	0%	2%[ur]	22%
	Feb 11, 2020	Yang withdraws from the race
Survey USA/KING-TV[532]	Jan 26–28, 2020	536 (LV)	± 6.2%	21%	12%	8%	–	–	3%	26%	16%	4%	2%[us]	7%
	Dec 3, 2019	Harris withdraws from the race
	Aug 21, 2019	Inslee withdraws from the race
Zogby Analytics[533]	Jul 22 – Aug 1, 2019	1,265 (LV)	± 2.8%	19%	–	5%	9%	6%	1%	18%	14%	2%	11%[ut]	16%

The Arizona Democratic primary is scheduled to take place on March 17, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Tulsi Gabbard	Other/ Undecided[a]
270 to Win[534]	Mar 17, 2020	Mar 3–16, 2020	50.6%	29.4%	1.0%	19.0%
RealClear Politics[535]	Mar 17, 2020	Mar 6–15, 2020	51.7%	33.7%	1.0%	13.6%
FiveThirtyEight[536]	Mar 17, 2020	until Mar 16, 2020[d]	51.6%	26.9%	1.1%	20.4%
Average			51.3%	30.0%	1.0%	17.7%

Tabulation of individual polls of the 2020 Arizona Democratic primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Kamala Harris	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
Swayable[537]	Mar 16, 2020	1,167 (LV)	± 5.0%	53%	–	–	–	29%	–	–	19%[uu]	–
Marist/NBC News[538]	Mar 10–15, 2020	523 (LV)	± 6.0%	53%	–	–	–	36%	–	–	8%[uv]	3%
		913 (RV)	± 4.5%	50%	–	–	–	37%	–	–	9%[uw]	5%
Monmouth University[539]	Mar 11–14, 2020	373 (LV)	± 5.1%	51%	5%	3%	–	31%	3%	–	2%[ux]	5%
Latino Decisions/Univision/[[ Arizona State University]][540]	Mar 6–11, 2020	541 (LV)	± 4.2%	57%[uy]	–	–	–	38%[uy]	–	–	–	5%[uy]
				51%	–	–	–	34%	–	–	6%[uz]	8%
	March 4–5, 2020	Bloomberg and Warren withdraw from the race
OH Predictive Insights[541]	Mar 3–4, 2020	398 (LV)	± 4.9%	45%	12%	–	–	17%	13%	–	4%[va]	9%
	March 1–2, 2020	Buttigieg and Klobuchar withdraw from the race
	February 11, 2020	New Hampshire primary; Yang withdraws from the race after close of polls
	Dec 3, 2019	Harris withdraws from the race
OH Predictive Insights[542]	Oct 31 – Nov 8, 2019	260 (LV)	± 6.1%	29%	–	9%	5%	16%	18%	4%	19%[vb]	–
Emerson Polling[543]	Oct 25–28, 2019	339	± 5.2%	28%	–	12%	4%	21%	21%	5%	7%[vc]	–
Siena Research/New York Times[544]	Oct 13–26, 2019	209	–	24%	–	5%	3%	16%	15%	1%	1%[vd]	31%
Change Research[545]	Sep 27–28, 2019	396 (LV)	–	15%	–	13%	4%	19%	35%	8%	7%[ve]	–
Bendixen&Amandi[546]	Sep 9–12, 2019	250	± 4.3%	29%	–	5%	4%	18%	24%	2%	8%[vf]	10%
Zogby Analytics[547]	May 23–29, 2019	197	± 7.0%	35%	–	6%	4%	16%	10%	0%	11%[vg]	–

The Florida Democratic primary is scheduled to take place on March 17, 2020.^[18]

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Tulsi Gabbard	Other/ Undecided[a]
270 to Win[548]	Mar 17, 2020	Mar 5–16, 2020	65.5%	23.0%	1.8%	9.7%
RealClear Politics[549]	Mar 17, 2020	Mar 6–12, 2020	64.7%	25.7%	2.0%	7.6%
FiveThirtyEight[550]	Mar 17, 2020	until Mar 16, 2020 [d]	63.8%	24.7%	1.4%	10.1%
Average			64.7%	24.5%	1.7%	9.1%

Polling from February 12, 2020, to March 17, 2020
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Amy Klobuchar	Bernie Sanders	Elizabeth Warren	Other	Un- decided
Swayable[551]	Mar 16, 2020	4,035 (LV)	± 2.0%	64%	–	–	–	25%	–	12%[vh]	–
AtlasIntel[552]	Mar 14–16, 2020	532 (LV)	± 4.0%	67%	–	–	–	27%	–	4%[vi]	2%
Point Blank Political[553]	Mar 11–13, 2020	3,165 (LV)	± 2.3%	61%[uy]	–	–	–	32%[uy]	–	–	7%
				57%	2%	2%	0%	29%	4%	1%[vj]	5%
Emerson College/Nexstar[554]	Mar 11–12, 2020	434 (LV)	± 4.7%	65%	–	–	–	27%	–	2%[vk]	6%
Gravis Marketing[555]	Mar 10–12, 2020	516 (LV)	± 4.3%	66%	–	–	–	25%	–	–	9%
ROI Rocket[556]	Mar 6–12, 2020	877 (LV)	± 3.3%	67%	–	–	–	27%	–	–[vl]	–[vl]
Latino Decisions/Univision[557]	Mar 6–12, 2020	531 (LV)	± 4.3%	67%[uy]	–	–	–	32%[uy]	–	–	2%
				63%	–	–	–	25%	–	8%[vm]	4%
University of North Florida[558]	Mar 5–10, 2020	1,502 (LV)	± 2.5%	66%	2%	1%	<1%	22%	2%	1%[vn]	7%
St Pete Polls/FloridaPolitics.com[559]	Mar 6–8, 2020	2,480 (LV)	± 2.0%	69%	5%	2%	1%	14%	1%	0%[vo]	9%
Point Blank Political[560]	Mar 6–8, 2020	3,376 (LV)	± 2.3%	61%[uy]	–	–	–	32%[uy]	–	–	7%
				55%	2%	2%	1%	29%	4%	2%[vp]	7%
Florida Atlantic University[561]	Mar 5–7, 2020	399 (LV)	± 4.9%	61%	–	–	–	25%	–	3%[vq]	10%
	Mar 4–5, 2020	Bloomberg and Warren withdraw from the race
St Pete Polls/FloridaPolitics.com[562]	Mar 4, 2020	1,882 (LV)	± 2.3%	61%	14%	1%	1%	12%	5%	0%[vr]	6%
	Mar 1–2, 2020	Buttigieg and Klobuchar withdraw from the race
St Pete Polls[563]	Feb 25–26, 2020	2,788 (LV)	± 1.9%	34%	25%	8%	4%	13%	5%	1%[vs]	10%
Saint Leo University[564]	Feb 17–22, 2020	342 (LV)	–	25%	25%	11%	5%	17%	7%	4%[vt]	7%
Florida Southern College[565]	Feb 17–21, 2020	313 (LV)	± 5.54%	22%	23%	9%	5%	18%	12%	1%[vu]	9%
St Pete Polls[563]	Feb 18–19, 2020	2,412 (LV)	± 2.0%	27%	32%	8%	7%	11%	5%	2%[vv]	10%
Tel Opinion Research/Politico/[[ Let’s Preserve the American Dream]][566]	Feb 13–18, 2020	800 (LV)	± 3.46%	20%	26%	8%	5%	13%	7%	5%[vw]	16%
St Pete Polls[567]	Feb 12–13, 2020	3,047 (LV)	± 1.8%	26%	27%	11%	9%	10%	5%	1%[vx]	11%

Polling before February 11, 2020
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Cory Booker	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Un- decided
	Feb 11, 2020	New Hampshire primary; Yang withdraws from the race after close of polls
St. Pete Polls[568]	Jan 27–28, 2020	2,590 (LV)	± 1.9%	41%	17%	–	6%	–	5%	–	9%	7%	2%	2%[vy]	10%
Tel Opinion Research/Let’s Preserve the American Dream/Politico[569]	Jan 21–23, 2020	600 (LV)	± 4%	41%[vz]	–	–	–	–	–	–	21%	18%	–	–	20%
				29%	4%	–	4%	–	4%	–	17%	12%	2%	2%[wa]	28%
	Jan 13, 2020	Booker withdraws from the race
Florida Atlantic University[570]	Jan 9–12, 2020	494	± 4.4%	42%	7%	3%	3%	–	6%	–	16%	10%	5%	5%[wb]	4%[wc]
	Dec 3, 2019	Harris withdraws from the race
	Nov 24, 2019	Bloomberg announces his candidacy
	Nov 1, 2019	O'Rourke withdraws from the race
Siena College/New York Times[571]	Oct 13–26, 2019	650 (RV)	± 4.4%	27%	–	0%	5%	1%	2%	0%	13%	19%	0%	1%[wd]	29%
Tel Opinion Research[572]	Sep 15–18, 2019	800 (LV)	± 3.54%	43%	–	–	–	–	–	–	10%	26%	–	–	18%
				37%	–	–	5%	6%	–	–	9%	18%	2%	–	20%
				24%	–	–	2%	3%	–	–	5%	11%	1%	3%[we]	49%
Florida Atlantic University[573]	Sep 12–15, 2019	407	± 4.9%	34%	–	1%	5%	4%	0%	2%	14%	24%	2%	8%[wf]	6%
St. Pete Polls[574]	Jun 22–23, 2019	2,022	± 2.2%	47%	–	3%	8%	6%	–	2%	8%	12%	–	7%	6%
Change Research[575]	Jun 16–17, 2019	1,130	± 2.9%	33%	–	2%	15%	7%	2%	3%	20%	15%	3%	2%[wg]	–
Quinnipiac University[576]	Jun 12–17, 2019	417	± 5.8%	41%	–	1%	8%	6%	1%	1%	14%	12%	<1%	1%[wh]	12%
Climate Nexus[577]	Jun 7–11, 2019	676	± 2.6%	32%	–	2%	6%	6%	1%	2%	16%	10%	2%	9%[wi]	14%
Zogby Analytics[578]	May 23–29, 2019	228	± 6.5%	34%	–	2%	6%	2%	1%	4%	18%	7%	1%	6%[wj]	–
Florida Atlantic University[579]	May 16–19, 2019	403	± 4.9%	39%	–	1%	9%	7%	1%	5%	12%	12%	1%	14%[wk]	–
Tel Opinion Research[580]*	May 8, 2019	800	± 3.5%	39%	–	1%	3%	5%	1%	1%	16%	5%	–	–	28%
	Apr 25, 2019	Biden announces his candidacy
	Apr 14, 2019	Buttigieg announces his candidacy
Tel Opinion Research[580]*	Mar 21, 2019	800	± 3.5%	37%	–	2%	–	4%	1%	5%	13%	6%	–	–	31%
	Mar 14, 2019	O'Rourke announces his candidacy
Bendixen & Amandi International[581]	Mar 1–4, 2019	300	–	26%	1%	1%	0%	9%	1%	1%	11%	4%	0%	0%[wl]	46%
	Feb 19, 2019	Sanders announces his candidacy
	Feb 9, 2019	Warren announces her candidacy
	Feb 1, 2019	Booker announces his candidacy
	Jan 21, 2019	Harris announces her candidacy
Saint Leo University[582]	May 25–31, 2018	–	–	21%	–	3%	–	4%	–	–	11%	7%	–	34%[wm]	17%

The Illinois Democratic primary is scheduled to take place on March 17, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Tulsi Gabbard	Un- decided[a]
270toWin[583]	Mar 17, 2020	Mar 7–16, 2020	58.6%	30.2%	2.0%	9.2%
RealClear Politics[584]	Mar 17, 2020	Mar 10–12, 2020	60.0%	30.5%	–[wn]	9.5%
FiveThirtyEight[585]	Mar 17, 2020	until Mar 16, 2020[d]	61.5%	26.6%	1.5%	10.4%
Average			60.0%	29.1%	1.8%	9.1%

Tabulation of individual polls of the 2020 Illinois Democratic primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Bernie Sanders	Elizabeth Warren	Other	Undecided
Swayable[586]	Mar 16, 2020	1,861 (LV)	± 3.0%	63%	–	–	–	–	28%	–	10%[wo]	–
Emerson College/Nexstar[587]	Mar 11–12, 2020	567 (LV)	± 4.1%	57%	–	–	–	–	36%	–	2%[wp]	6%
Gravis Marketing[588]	Mar 10–12, 2020	549 (LV)	± 4.2%	63%	–	–	–	–	25%	–	–	12%
ROI Rocket[589]	Mar 6–12, 2020	960 (LV)	± 3.1%	57%	–	–	–	–	34%	–	–[vl]	–[vl]
Victory Research[590]	Mar 7–9, 2020	1,200 (LV)	± 2.83%	55%	–	–	–	–	36%	–	1%[wq]	8%
Ogden & Fry/Northwest Side GOP Club[591]	Mar 8, 2020	457(LV)	± 4.58%	64%	–	–	–	–	32%	–	4%[wr]	–[ws]
				55%	–	–	–	–	26%	–	2%[wt]	16%
	Mar 1–5, 2020	Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race
Victory Research[592]	Feb 17–19, 2020	1,200(LV)	± 2.83%	20.3%	14.5%	11.4%	–	6.3%	25.6%	6.6%	4.4%[wu]	10.9%
Southern Illinois University[593]	Feb 10–17, 2020	475 (LV)	± 4.5%	14%	17%	13%	–	8%	22%	6%	2%[wv]	17%
	Dec 3, 2019	Harris withdraws from the race
Victory Research[594]	Nov 27 – Dec 1, 2019	1,500 (RV)	±2.83%	23.2%	3.6%	15.9%	3.2%	2.6%	15.0%	17.4%	12.3%[ww]	6.9%
Victory Research[595]	Jul 26–29, 2019	1,200	± 2.83%	36.1%	–	9.3%	8.6%	1.7%	15.2%	12.8%	9.2%[wx]	7.3%

The Wisconsin Democratic primary is scheduled to take place on April 7, 2020.^[18]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Other/ Undecided[a]
270 to Win[596]	April 5, 2020	March 6–29, 2020	55.3%	37.0%	7.7%
RealClear Politics[597]	April 5, 2020	March 6–29, 2020	55.3%	37.0%	7.7%
FiveThirtyEight[598]	April 5, 2020	until March 29, 2020 [d]	51.6%	36.0%	12.4%
Average			54.1%	36.7%	9.2%

Tabulation of individual polls of the 2020 Wisconsin Democratic Primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Cory Booker	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Un- decided
Marquette University Law School[599][14]	Mar 24–29, 2020	394 (LV)	± 5.9%	62%	–	–	–	–	–	34%	–	–	–	4%[wy]
Public Policy Polling[600]	Mar 10–11, 2020	898(LV)	–	55%	–	–	–	–	–	39%	–	–	3%[wz]	3%
YouGov/Yahoo News[601]	Mar 6–8, 2020	–(RV)[tg]	± 6.4%	49%	–	–	–	–	–	38%	–	–	–	–
	Mar 1–5, 2020	Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race
Marquette University Law School[602]	Feb 19–23, 2020	490 (LV)	± 5.1%	15%	17%	–	13%	–	11%	29%	9%	–	2%[xa]	4%
YouGov/University of Wisconsin-Madison[603]	Feb 11–20, 2020	428 (LV)	–	13%	13%	–	12%	–	9%	30%	12%	–	–	11%[xb]
	Feb 11, 2020	New Hampshire primary; Yang withdraws from the race after close of polls
Baldwin Wallace University/Oakland University/Ohio Northern University[604]	Jan 8–20, 2020	464 (RV)	–	21.8%	8.4%	–	7.7%	–	3%	28.4%	14.7%	2.2%	2.5%[xc]	10.9%
	Jan 13, 2020	Booker withdraws from the race
Marquette University Law School[605][15]	Jan 8–12, 2020	358 (LV)	± 6.3%	23%	6%	1%	15%	–	4%	19%	14%	6%	3%[xd]	9%
Fox News[606]	Jan 5–8, 2020	671 (LV)	± 3.5%	23%	7%	3%	9%	–	4%	21%	13%	3%	6%[xe]	10%
Marquette University Law School[607][16]	Dec 3–8, 2019	358 (LV)	± 6.3%	23%	3%	4%	15%	–	3%	19%	16%	3%	3%[xf]	11%
	Dec 3, 2019	Harris withdraws from the race
	Nov 24, 2019	Bloomberg announces his candidacy
Marquette University Law School[608]	Nov 13–17, 2019	801 (RV)	–	30%	–	3%	13%	2%	3%	17%	15%	2%	6%[xg]	10%
Siena Research/New York Times[609]	Oct 13–26, 2019	292	–	23%	–	1%	5%	1%	0%	20%	25%	2%	2%[xh]	19%
Kaiser Family Foundation[610]	Sep 23 – Oct 15, 2019	274 (LV)	–	17%	–	2%	6%	3%	3%	10%	22%	2%	1%[xi]	35%
Fox News[611]	Sep 29 – Oct 2, 2019	663 (LV)	± 3.5%	28%	–	2%	7%	5%	2%	17%	22%	2%	5%[xj]	9%
Marquette University Law School[612]	Aug 25–29, 2019	444 (RV)	± 5.3%	28%	–	1%	6%	3%	1%	20%	17%	2%	5%[xk]	13%
Change Research[613]	Aug 9–11, 2019	935 (LV)	± 3.2%	20%	–	1%	9%	5%	2%	24%	29%	2%	5%[xl]	–
Change Research[614]	Jun 29 – Jul 4, 2019	1261 (LV)	–	18%	–	3%	15%	17%	1%	19%	19%	1%	6%[xm]	–
Zogby Analytics[615]	May 23–29, 2019	238 (LV)	± 6.4%	28%	–	2%	7%	7%	3%	13%	14%	0%	2%[xn]	–
	Apr 25, 2019	Biden announces his candidacy
Zogby Analytics[616]	Apr 15–18, 2019	485 (LV)	± 4.5%	24%	–	4%	10%	7%	4%	20%	6%	1%	11%[xo]	14%
	Apr 14, 2019	Buttigieg announces his candidacy
Emerson College[617]	Mar 15–17, 2019	324 (LV)	± 5.4%	24%	–	2%	1%	5%	4%	39%	14%	1%	10%[xp]	–

The Ohio Democratic primary was originally scheduled to take place on March 17, 2020.^[18] Due to the COVID-19 pandemic, the primary was delayed. Initially, the Governor suggested the primary be held on June 2, 2020,^[618] however, further deliberations resulted in the legislature and Governor agreeing on suspending in-person voting, and selecting a mail-in ballot deadline of April 28, 2020.^[619]

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Other/ Undecided[a]
270 to Win[620]	Mar 16, 2020	Mar 10–13, 2020	57.5%	35.0%	7.5%
RealClear Politics[621]	Mar 16, 2020	Mar 10–13, 2020	57.5%	35.0%	7.5%
FiveThirtyEight[622]	Mar 16, 2020	until Mar 13, 2020 [d]	58.7%	32.3%	9.0%
Average			57.9%	34.1%	8.0%

Tabulation of individual polls of the 2020 Ohio Democratic primary
Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Cory Booker	Pete Buttigieg	Kamala Harris	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
	Apr 8, 2020	Sanders suspends his campaign: Politico Story
Swayable[623]	Mar 16, 2020	2,027 (LV)	± 3.0%	66%	–	–	–	–	24%	–	–	10%[xq]	–
Marist/NBC News[624]	Mar 10–13, 2020	486 (LV)	± 5.6%	58%	–	–	–	–	35%	–	–	4%[xr]	4%
		830 (RV)	± 4.1%	56%	–	–	–	–	36%	–	–	4%[xs]	4%
Emerson College/Nexstar[625]	Mar 11–12, 2020	464 (LV)	± 4.5%	57%	–	–	–	–	35%	–	–	1%[xt]	7%
ROI Rocket[626]	Mar 6–12, 2020	880 (LV)	± 3.3%	61%	–	–	–	–	33%	–	–	–[vl]	–[vl]
	Mar 5, 2020	Warren withdraws from the race
	Mar 4, 2020	Bloomberg withdraws from the race: NYT Story
	Mar 2, 2020	Klobuchar withdraws from the race: NYT Story
	Mar 1, 2020	Buttigieg withdraws from the race: NYT Story
	Feb 29, 2020	South Carolina primary; Steyer withdraws from the race after close of polls
	Feb 11, 2020	New Hampshire primary; Yang and Bennet withdraw from the race after close of polls
	Feb 3, 2020	Iowa Caucuses
Baldwin Wallace University/Oakland University/Ohio Northern University[627]	Jan 8–20, 2020	428 (RV)	–	32.1%	10.1%	–	6.1%	–	20.8%	10.7%	2.1%	5.7%[xu]	9.8%
	Jan 13, 2020	Booker withdraws from the race
	Jan 10, 2020	Williamson withdraws from the race
	Jan 2, 2020	Castro withdraws from the race
	Dec 3, 2019	Harris withdraws from the race
	Nov 24, 2019	Bloomberg announces his candidacy
	Nov 1, 2019	O'Rourke withdraws from the race
	Oct 24, 2019	Ryan withdraws from the race
Climate Nexus[628]	Oct 1–7, 2019	443 (LV)	–	32%	–	3%	5%	6%	13%	21%	3%	17%[xv]	–[note 1]
Emerson[629]	Sep 29 – Oct 2, 2019	353 (LV)	± 5.2%	29%	–	0%	5%	7%	27%	21%	3%	5%[xw]	2%
Quinnipiac[630]	Jul 17–22, 2019	556	± 5.1%	31%	–	1%	6%	14%	14%	13%	1%	6%[xx]	11%
Zogby Analytics[631]	May 23–29, 2019	222	± 6.6%	29%	–	3%	6%	5%	19%	12%	3%	6%[xy]	–

The Kansas Democratic primary is scheduled to take place on May 2, 2020.^[18]

Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Tulsi Gabbard	Bernie Sanders	Other	Undecided
	Apr 8, 2020	Sanders suspends campaign
	Mar 19, 2020	Gabbard withdraws from the race
Public Policy Polling[632]	Mar 10–11, 2020	550 (LV)	–	59%	3%	35%	–	4%

The Oregon Democratic primary is scheduled to take place on May 19, 2020.^[18]

Poll source	Date(s) administered	Sample size	Margin of error	Bernie Sanders	Joe Biden	Undecided	Beto O'Rourke	Kamala Harris	Elizabeth Warren	Cory Booker	Andrew Yang	Pete Buttigieg	Other
Zogby Analytics[633]	Mar 18–19, 2019	238	± 6.4%	27%	26%	11%	8%	6%	6%	4%	4%	3%	7% [xz]

The Delaware Democratic primary was scheduled to take place on April 28, 2020,^[18] but was delayed due to the COVID-19 pandemic, and will instead occur on June 2, 2020.^[634]

Poll source	Date(s) administered	Sample size	Margin of error	Joe Biden	Cory Booker	Pete Buttigieg	Tulsi Gabbard	Kamala Harris	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
	Apr 8, 2020	Sanders suspends his campaign
	Mar 19, 2020	Gabbard withdraws from the race
	Mar 1–5, 2020	Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race
	Jan 13, 2020	Booker withdraws from the race
	Dec 3, 2019	Harris withdraws from the race
Data For Progress[635]	Nov 15–25, 2019	481 (LV)	–[ya]	35%	3%	8%	3%	1%	13%	11%	1%	10%[yb]	15%

The Indiana Democratic primary was scheduled to take place on May 5, 2020,^[18] but was delayed due to the COVID-19 pandemic, and will instead occur on June 2, 2020.^[636]

Poll source	Date(s) administered	Sample size	Margin of error	Joe Biden	Pete Buttigieg	Kamala Harris	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Other	Undecided
	Apr 8, 2020	Sanders suspends his campaign
	Nov 1, 2019–March 5, 2020	O'Rourke, Harris, Buttigieg and Warren withdraw from the race
We Ask America[637]	Apr 29–May 5, 2019	280	± 5.9%	33%	20%	3%	2%	23%	2%	1%[yc]	15%

The Maryland Democratic primary was scheduled to take place on April 28, 2020,^[18] but was delayed due to the COVID-19 pandemic, and will instead occur on June 2, 2020.^[638]

Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Bernie Sanders	Elizabeth Warren	Other	Undecided
	Apr 8, 2020	Sanders suspends his campaign
	Mar 1–5, 2020	Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race
Gonzales Research & Media Services[639]	Feb 22–28, 2020	331 (LV)	± 5.5%	19%	15%	5%	–	4%	23%	8%	–	27%
Goucher College[640]	Feb 13–19, 2020	371 (LV)	± 5.1%	18%	16%	7%	–	6%	24%	6%	4%[yd]	18%
	Dec 3, 2019	Harris withdraws from the race
Goucher College[640]	Sept 13–19, 2019	300 (LV)	± 5.6%	33%	–	5%	6%	1%	10%	21%	9%[ye]	15%

The Montana Democratic primary is scheduled to take place on June 2, 2020.^[18] Polls with a sample size of <100 are marked in red to indicate a lack of reliability.

Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Steve Bullock	Pete Buttigieg	Kamala Harris	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
	Apr 8, 2020	Sanders suspends his campaign
	Nov 1, 2019–March 5, 2020	O'Rourke, Bullock, Harris, Yang, Buttigieg and Warren withdraw from the race
Montana State University Billings[641]	Oct 7–16, 2019	40 (LV)	–	15%	5%	2%	2%	5%	2%	40%	No voters	2%[yf]	25%

The New Mexico democratic primary is scheduled to take place on June 2, 2020.^[18]

Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Cory Booker	Pete Buttigieg	Tulsi Gabbard	Amy Klobuchar	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
	Apr 8, 2020	Sanders suspends his campaign
	Mar 1–19, 2020	Buttigieg, Klobuchar, Bloomberg, Warren, and Gabbard withdraw from the race
	Jan 13–Feb 11, 2020	Booker and Yang withdraw from the race
Emerson Polling[642]	Jan 3–6, 2020	447 (RV)	± 4.6%	27%	3%	2%	7%	2%	2%	28%	8%	10%	11%[yg]	-

The Pennsylvania Democratic primary was scheduled to take place on April 28, 2020,^[18] but was delayed due to the COVID-19 pandemic, and is instead scheduled for June 2, 2020.^[643]

Polling Aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Other/ Undecided[a]
270 to Win[644]	Mar 18, 2020	Feb 11–Mar 8, 2020	39.5%	28.0%	32.5%
RealClear Politics[645]	Feb 23, 2020	Jan 20–Feb 20, 2020	39.5%	28.0%	32.5%
FiveThirtyEight[646]	Mar 8, 2020	until Feb 20, 2020[d]	54.4%	29.3%	16.3%
Average			44.5%	28.4%	27.1%

Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Cory Booker	Pete Buttigieg	Kamala Harris	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Other	Undecided
	Apr 8, 2020	Sanders suspends his campaign
YouGov/Yahoo News[647]	Mar 6–8, 2020	–(RV)[tg]	± 5.1%	59%	–	–	–	–	–	31%	–	–	–
	Mar 1–5, 2020	Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race
YouGov/University of Wisconsin-Madison[648]	Feb 11–20, 2020	537 (LV)	–	20%	19%	–	12%	–	–	25%	9%	5%[yh]	10%[yi]
	Feb 11, 2020	New Hampshire primary; Yang withdraws from the race after close of polls
Franklin & Marshall College[649]	Jan 20–26, 2020	292 (RV)	± 9.0%	22%	7%	–	6%	–	–	15%	14%	18%[yj]	19%
Baldwin Wallace University/Oakland University/Ohio Northern University]][650]	Jan 8–20, 2020	502 (RV)	–	31.3%	9.1%	–	6.5%	–	–	20.5%	11.5%	8.8%[yk]	11%
	Dec 3, 2019–Jan 13, 2020	Harris and Booker withdraw from the race
	Nov 24, 2019	Bloomberg announces his candidacy
	Nov 1, 2019	O'Rourke withdraws from the race
Franklin & Marshall College[651]	Oct 21–27, 2019	226 (RV)	± 8.9%	30%	–	1%	8%	1%	<1%	12%	18%	15%[yl]	16%
Siena Research/New York Times[652]	Oct 13–26, 2019	304	–	28%	–	0%	4%	1%	0%	14%	16%	3%[ym]	30%
Kaiser Family Foundation[653]	Sep 23–Oct 15, 2019	246 (LV)	–	27%	–	1%	3%	4%	No voters	14%	18%	5%[yn]	29%
Susquehanna Polling and Research Inc.[654]	Sep 30–Oct 6, 2019	307 (RV)	± 5.6%	17%	–	0%	8%	1%	0%	6%	9%	7%[yo]	52%
Franklin & Marshall College[655]	Jul 29–Aug 4, 2019	295	± 8.7%	28%	–	2%	6%	8%	1%	12%	21%	3%[yp]	19%
Zogby Analytics[656]	May 23–29, 2019	246	± 6.3%	46%	–	2%	9%	3%	2%	15%	8%	2%[yq]	–
Quinnipiac University[657]	May 9–14, 2019	431	± 6.2%	39%	–	5%	6%	8%	2%	13%	8%	3%[yr]	12%
	Apr 25, 2019	Biden announces his candidacy
	Apr 14, 2019	Buttigieg announces his candidacy
Muhlenberg College[658]	Apr 3–10, 2019	405	± 5.5%	28%	–	3%	4%	8%	3%	16%	8%	9%[ys]	20%
Emerson College[659]	Mar 26–28, 2019	359	± 5.1%	39%	–	4%	6%	5%	5%	20%	11%	10%[yt]	–

The Georgia Democratic primary was originally scheduled to take place on March 24, 2020,^[18] but was delayed due to the COVID-19 pandemic, first to May 19, 2020,^[660] and then further delayed to June 9, 2020.^[661]

Polling aggregation
Source of poll aggregation	Date updated	Dates Polled	Joe Biden	Bernie Sanders	Undecided[a]
FiveThirtyEight[662]	Mar 14, 2020	until Feb 13, 2020[d]	67.3%	30.1%	2.6%

Poll source	Date(s) administered	Sample size	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Kamala Harris	Bernie Sanders	Elizabeth Warren	Andrew Yang	Other	Undecided
	Apr 8, 2020	Sanders suspends his campaign
The Progress Campaign (D)	Mar 12–21, 2020	913 (RV)	± 4.6%	63%	–	–	–	34%	–	–	–	2.3%[yu]
University of Georgia[663]	Mar 4–14, 2020	807	± 3.4%	66%	–	–	–	22%	–	–	1%[yv]	11%
	Mar 5, 2020	Warren withdraws from the race
	Mar 4, 2020	Bloomberg withdraws from the race
	Mar 1, 2020	Buttigieg withdraws from the race
Landmark Communications[664]	Feb 12, 2020	500	± 4.3%	32%	14%	5%	–	14%	4%	–	6%[yw]	26%
	Feb 11, 2020	Yang withdraws from the race
	Dec 3, 2019	Harris withdraws from the race
SurveyUSA[665]	Nov 15–18, 2019	536	± 5.2%	36%	6%	7%	6%	17%	14%	–	5%	9%
Climate Nexus[666]	Nov 4–10, 2019	457	± 3.6%	31%	–	4%	4%	14%	14%	2%	11%[yx]	19%
Landmark Communications[667]	Sep 18–21, 2019	500	± 4.1%	41%	–	5%	6%	8%	17%	2%	6%[yy]	15%
Change Research[668]	Sep 7–11, 2019	755	± 3.6%	33%	–	7%	7%	17%	22%	3%	10%[yz]	–
SurveyMonkey[669]	Jul 2–16, 2019	402	± 6.4%	31%	–	5%	15%	12%	13%	4%	11%[za]	9%

The New York Democratic primary was scheduled to take place on April 28, 2020,^[18] but was delayed due to the COVID-19 pandemic, and is instead scheduled for June 23, 2020.^[670]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Other/ Undecided[a]
FiveThirtyEight[671]	Mar 18, 2020	until Mar 18, 2020 [d]	51.7%	28.9%	21.4%

Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Michael Bloomberg	Pete Buttigieg	Kamala Harris	Amy Klobuchar	Bernie Sanders	Elizabeth Warren	Other	Un- decided
	Apr 8, 2020	Sanders suspends his campaign
	Mar 19, 2020	Gabbard withdraws from the race
	Mar 1–5, 2020	Buttigieg, Klobuchar, Bloomberg, and Warren withdraw from the race
Siena College Research Institute[672]	Feb 16–20, 2020	315 (RV)	–	13%	21%	9%	–	9%	25%	11%	1%[zb]	11%
	Feb 3, 2020	Iowa caucus is held
Civis Analytics/Data For Progress[673]	Jan 13–19, 2020	845 (LV)	–	30%	17%	7%	–	2%	17%	14%	15%[zc]	–
	Dec 3, 2019	Harris withdraws from the race
Siena College[674]	Nov 12–18, 2019	797 (RV)	± 4.0%	24%	–	5%	3%	1%	13%	14%	12%[zd]	29%[ze]
Siena College[675]	Oct 6–10, 2019	340 (RV)	± 6.5%	21%	–	4%	4%	1%	16%	21%	10%[zf]	24%[zg]
	Sep 20, 2019	de Blasio withdraws from the race
Siena College[676]*	Sep 8–12, 2019	359 (RV)	± 6.1%	22%	–	3%	4%	1%	15%	17%	4%[zh]	34%
	Aug 28, 2019	Gillibrand withdraws from the race

Poll source	Date(s) administered	Sample size[g]	Margin of error	Bill de Blasio	Kirsten Gillibrand	Other	Undecided
Siena College[677]	Jun 2–6, 2019	385	–	25%	56%	11%	8%

The New Jersey Democratic primary was scheduled to take place on June 2, 2020,^[18] but was delayed due to the COVID-19 pandemic, and is instead scheduled for July 7, 2020.^[678]

Polling aggregation
Source of poll aggregation	Date updated	Dates polled	Joe Biden	Bernie Sanders	Undecided[a]
FiveThirtyEight[679]	Mar 8, 2020	until Feb 18, 2020[d]	35.5%	30.5%	34.0%

Poll source	Date(s) administered	Sample size	Margin of error	Joe Biden	Michael Bloomberg	Cory Booker	Pete Buttigieg	Kamala Harris	Beto O'Rourke	Bernie Sanders	Elizabeth Warren	Other	Undecided
	Mar 5, 2020	Warren withdraws from the race
	Mar 4, 2020	Bloomberg withdraws from the race
	Mar 3, 2020	Super Tuesday
	Mar 2, 2020	Klobuchar withdraws from the race
	Mar 1, 2020	Buttigieg withdraws from the race
	Feb 29, 2020	South Carolina primary; Steyer withdraws from the race after close of polls
	Feb 22, 2020	Nevada caucuses
FDU[680][17]	Feb 12–16, 2020	357 (RV)	–	16%	23%	–	10%	–	–	25%	8%	7%[zi]	11%
	Feb 11, 2020	New Hampshire primary; Yang withdraws from the race
	Feb 3, 2020	Iowa caucuses
Emerson College[681]	Jan 16–19, 2020	388	± 4.9%	28%	9%	–	6%	–	–	25%	15%	16%[zj]	–
	Jan 13, 2020	Booker withdraws from the race
	Dec 3, 2019	Harris withdraws from the race
	Nov 24, 2019	Bloomberg announces his candidacy
Monmouth University[682]	Sep 12–16, 2019	713	± 3.7%	26%	–	9%	6%	6%	0%	18%	20%	7%[zk]	8%
Change Research[683]	Aug 16–20, 2019	1176	± 2.9%	26%	–	5%	12%	8%	2%	21%	23%	3%[zl]	–

The Connecticut Democratic primary was scheduled to take place on April 28, 2020,^[18] but was delayed due to the COVID-19 pandemic, first to June 2, 2020,^[684] and then further delayed to August 11, 2020.^[685]

Poll source	Date(s) administered	Sample size[g]	Margin of error	Joe Biden	Bernie Sanders	Pete Buttigieg	Elizabeth Warren	Other	Undecided
	Apr 8, 2020	Sanders suspends his campaign
GreatBlue Research/Sacred Heart University/Hartford Courant[686]	Mar 24–Apr 3, 2020	– (RV)[zm]	–	52.0%	32.5%	–	–	1.4%[zn]	14.1%
GreatBlue Research/Sacred Heart University/Hartford Courant[687]	Feb 24–Mar 12, 2020	383 (RV)	–	42.1%	24.5%	–	–	19.5%[zo]	13.8%
	Mar 5, 2020	Warren withdraws from the race
	Mar 1, 2020	Buttigieg withdraws from the race
GreatBlue Research/Sacred Heart University/Hartford Courant[688][18]	Dec 16, 2019–Jan 2, 2020	348 (RV)	–	33.0%	19.3%	11.2%	17.8%	3.4%[zp]	15.2%

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