Katherine Marlea Clark is a politician. Currently, she is the United States Representative for Massachusetts's 5th congressional district and the assistant House Democratic leader (officially, the "Assistant Speaker"), making her the fourth-highest-ranking House Democrat.Before seeking federal office, Clark was a member of the Massachusetts House of Representatives and of the Massachusetts Senate. Before that, she was an attorney. She worked in several states before moving to Massachusetts in 1995 and beginning work in state government. She was first elected to the state legislature in 2008.