He was vice chair of the Appropriations Committee and co-chaired the Health Care Reform Commission.
[2] On February 6, 2009, Larson introduced a bill to legalize same-sex marriage on behalf of 59 co-sponsors.
[5] On April 3, the House passed an amended version of the bill 95–52, several votes shy of a veto-proof two-thirds majority.
"[14][15] Vermont abandoned the plan in 2014, citing costs and tax increases as too high to implement.
[18] Larson endorsed Vermont Progressive Party nominee Emma Mulvaney-Stanak in the 2024 Burlington mayoral election.