Photo from The Lyndon B. Johnson Presidential Library

Robert Kennedy was JFK's younger brother, with whom he served as Attorney General. In 1965 he was elected to the Senate for New York, and the popularity of the Kennedy clan contributed to his high public profile. He became a strong critic of Johnson's policy in Indochina, especially after the bombing of North Vietnam was resumed in January 1966. Robert Kennedy challenged Johnson's bid for reelection in the campaign of 1968, posing a bigger threat for the incumbent President than the other Democratic hopeful, anti-war Senator Eugene McCarthy. Robert Kennedy, though, was assassinated in June, before the Democratic convention. Kennedy's search for the nomination emphasized the profound divisions within the Democratic party that contributed to Nixon's victory in that year's election.

Relevant Links

Robert Kennedy announces his candidacy (sound, Real Audio)
From the History Channel
http://www.historychannel.com/speeches/archive/speech_164.html

Robert Kennedy announced his bid for the presidency in this March 14, 1968 speech, wherein he promises to "seek new policies to end the war in Vietnam."