Mike Thompson represents California's 5th Congressional District. The district includes all of Napa and parts of Contra Costa, Lake, Solano and Sonoma Counties. He was first elected in 1998. Prior to serving in Congress, Thompson represented California's 2nd District in the California State Senate, where he chaired the powerful Budget Committee.

Thompson is a member of the House Committee on Ways and Means and serves as Chairman of the Select Revenue Measures Subcommittee and as a senior member of the Health Subcommittee.