During the course of the 2022 campaign, Tennyson faced abuse and intimidation. On one occasion, he was verbally abused and told to leave a 'Protestant area' when canvassing in Lurgan.[12]
At a sitting of the Assembly on 30 May 2022, Tennyson accused the Democratic Unionist Party (DUP) of treating the public as "leverage", after the party refused to assent to the election of a Speaker and blocked formation of an Assembly in protest over the Northern Ireland Protocol.[13] He subsequently called on the Secretary of State for Northern Ireland to stop the salaries of MLAs who refused to enter the Assembly in order to incentivise the DUP to "get back to work".[14] Following the restoration of devolution in February 2024, Tennyson was appointed to the Committee for Finance and became a member of the Northern Ireland Policing Board.[15][16]
In a campaign announcement video uploaded to X, Tennyson stated that "my candidacy is not about a change in direction, but a change in gear. I'm keen to build on the momentum left behind by Stephen [Farry] and his enormous legacy and to work with Naomi [Long] and our vibrant leadership team to grow the party even further."[21]
Deputy leader of the Alliance Party
Tennyson was elected deputy leader of the Alliance Party on 8 October 2024. He said working with party leader Naomi Long is an "important role" that he was excited to begin.[22]