Paul David Wellstone (July 21, 1944 - October 25, 2002) was a two-term U.S. Senator from the state of Minnesota and member of the Democratic-Farmer-Labor Party, which is affiliated with the national Democratic Party. Before being elected to the Senate in 1990, he was a professor of political science at Carleton College. Wellstone was a liberal and a leading spokesman for the liberal wing of the national Democratic Party. He served in the Senate from 1991 until his death in a plane crash on 25 October 2002, 11 days before the US senate election in which he was running for a third term. His wife, Sheila, and daughter, Marcia, also died in the crash. They had two other grown children, David and Mark, who now co-chair the Wellstone Action nonprofit group.