Mark William Pocan ( POH-kan; born August 14, 1964) is an American politician and businessman serving as the U.S. representative from Wisconsin's 2nd congressional district since 2013. The district is based in the state capital, Madison. A member of the Democratic Party, Pocan is co-chair of the Congressional LGBT Equality Caucus and chair emeritus of the Congressional Progressive Caucus. From 1999 to 2013 he served as a member of the Wisconsin State Assembly, representing the 78th district, succeeding Tammy Baldwin there, whom he also replaced in the House when Baldwin was elected to the U.S. Senate.