Mark William Pocan 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.

Wisconsin's 2nd congressional district is a congressional district of the United States House of Representatives in southern Wisconsin, covering Dane County, Iowa County, Lafayette County, Sauk County and Green County, as well as portions of Richland County and Rock County. The district includes Madison, the state's capital, its suburbs and some of the surrounding areas. Like many districts anchored by a college town, the district is heavily Democratic, and includes the University of Wisconsin-Madison.