About Mike Mansfield:
Michael Joseph "Mike" Mansfield was an American politician and diplomat. A member of the Democratic Party, he served as a U.S. Representative (1943–1953) and a U.S. Senator (1953–1977) from Montana. He was the longest-serving Senate Majority Leader, serving from 1961 to 1977. During his tenure, he shepherded Great Society programs through the Senate and strongly opposed the Vietnam War.