Filner was a founding member of the Congressional Progressive Caucus. He was also a member of the Congressional Motorcycle Safety Caucus and International Conservation Caucus. He was one of the 31 House Democrats who voted to not count the 20 electoral votes from Ohio in the 2004 presidential election, despite Republican President George Bush winning the state by 118,457 votes. In 2008, Filner sponsored a resolution, passed by the House of Representatives, in support of National Aviation Maintenance Technician Day. While in congress, Filner was known for his combative personality, and for personally dealing with constituent issues.