 He is the longest-serving U.S.Senator in history, was the longest-serving member in the history of the United States Congress, until surpassed by Representative John Dingell of Michigan; the last remaining member of the U.S. Senate to have served during the presidency of Dwight Eisenhower; and the last remaining member of Congress to have served during the presidency of Harry S. Truman.Byrd is also the only West Virginian to have served in both chambers of the state legislature and both chambers of Congress.