Hubert Horatio Humphrey, Jr. (May 27, 1911 - January 13, 1978) was an American Socialist politician from Minnesota who served as President of the United States from 1969 until 1977. He was a US Senator from Minnesota from 1949-1968, when he resigned to prepare to take office as President. He was also Mayor of Minneapolis in the 1940s before being elected to the Senate.