Hubert Humphrey was one of the nation’s most prominent liberal politicians in the mid-20th century, and his long career made him one of the leading figures in U.S. Senate history. Known for his oratorical skill, he argued tirelessly for legislation addressing issues of civil rights and nuclear disarmament, long before such causes became accepted by the mainstream. As Lyndon B. Johnson’s vice president, Humphrey lost the support of many liberal Americans as the voice of the administration’s Vietnam War policy. When Johnson stepped aside in 1968, Humphrey won the Democratic presidential nomination, losing by the narrowest of margins to Richard M. Nixon in the general election. In 1970, he returned to the Senate, where he remained until his death eight years later.