Hubert Humphrey served in the Senate.
Hubert Humphrey . Humphrey twice served in the United States Senate , representing Minnesota from 1949 to 1964 and 1971 to 1978 . Humphrey was elected to the Senate in 1948 , the year his proposal of ending racial segregation was included in the party platform at the Democratic National Convention , where he gave one of his most notable speeches on the convention floor , suggesting the Democratic Party `` walk into the sunshine of human rights . '' 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 .