This article's factual accuracy may be compromised due to out-of-date information. Please help update this article to reflect recent events or newly available information.(March 2016)
In the 1970s to the 1990s, members of MAS hoped that the party would become the third largest political force, challenging the dominant Social Christian and Democratic Action parties. However, the party often won less than 5% of the vote. At the 1993 election it supported the National Convergence coalition which successfully backed Rafael Caldera, contributing 10.59% of the vote, a third of Caldera's total. At the parliamentary elections the same year it achieved a high-water mark of 5 Senators and 24 Deputies.
MAS initially supported the government of Hugo Chávez in 1998. Petkoff disagreed with this decision and left the party. Disagreements between MAS and Chávez subsequently emerged, and MAS joined the opposition.