Tammy Suzanne Green Baldwin (born February 11, 1962) is an American politician serving as the junior United States Senator from Wisconsin since 2013. A member of the Democratic Party, she previously served three terms in the Wisconsin Assembly, representing the 78th district, and from 1999 to 2013 represented Wisconsin's 2nd congressional district in the United States House of Representatives. She was the first openly gay non-incumbent person elected to the House of Representatives, and the first open lesbian elected to Congress.