Hubert Humphrey served in the U.S. Senate.
Hubert Humphrey . Humphrey twice served in the United States Senate , representing Minnesota from 1949 to 1964 and 1971 to 1978 . Humphrey then returned to teaching in Minnesota before returning to the Senate in 1971 . He became the first Deputy President pro tempore of the United States Senate and served until his death in 1978 .