Humphrey did not enjoy working as a pharmacist, and his dream was to earn a doctorate in political science and become a college professor. In 1937 he returned to the University of Minnesota and earned a bachelor's degree in 1939. He was a member of Phi Delta Chi Fraternity. He also earned a master's degree from Louisiana State University in 1940, serving as an assistant instructor of political science. One of his classmates was Russell B. Long, who would become a U.S. Senator from Louisiana. He then became an instructor and doctoral student at the University of Minnesota from 1940 to 1941 (joining the American Federation of Teachers), and was a supervisor for the Works Progress Administration (WPA). Humphrey soon became active in Minneapolis politics, and as a result he never finished his PhD.He died of Bladder cancer in Waverley Minnesota at age 66
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