High Quality Content by WIKIPEDIA articles! The Hubert Humphrey presidential campaign of 1968 began when Vice President of the United States Hubert Humphrey of Minnesota decided to seek the Democratic Party nomination for President of the United States following the announcement by President Lyndon B. Johnson that he would not seek the party`s nomination. Johnson had been stalled by the anti-Vietnam War candidacy of Senator Eugene McCarthy of Minnesota, who along with Senator Robert F. Kennedy of New York, became the main opponents for Humphrey. The contest between the men, featured a battle for control of the Democratic Party, and cast Humphrey`s "old politics", against the "new politics" of McCarthy and Kennedy. The main cause of the division was the Vietnam War, which intensified during Humphrey`s tenure as Vice President and grew increasingly unpopular.