Minnesota's Hubert H. Humphrey was a two-term Senator (1949 to 1964 and 1971 to 1978) and Vice-president to Lyndon B. Johnson in the 1964 election which was won by a landslide. In 1968, after Johnson surprised the status quo by refusing to run for re-election, Humphrey entered the race, competing mainly against anti-Vietnam War Senators Robert F. Kennedy and Eugene McCarthy.
It was Humphrey's third try at the top job, having run unsuccessful campaigns in 1952 and 1960.
Humphrey was loyal to Johnson's Vietnam agenda and was seen as a stand-in for LBJ. His candidacy saw a lot of protests within his own party which ledto the tumultuous 1968 Democratic convention where many protesters were beaten by police on live television outside the convention center.
The assassinations of Martin Luther King Jr and Robert Kennedy, LBJ's unpopularity, and the Chicago demonstrations proved too much for Humphrey to overcome in time for the general election and he lost to President Richard M. Nixon by less than 1%.
Nixon got 43.4% of the vote, Humphrey got 42.7%, and third-party candidate George Wallace got 13.7%