The presidency of Lyndon Baines Johnson began on November 22, 1963, when Johnson became the 36th President of the United States upon the assassination of President John F. Kennedy, and ended on January 20, 1969. He had been Vice President of the United States for 1,036 days when he succeeded to the presidency. Johnson did not run for a second full term in the 1968 presidential election, he was succeeded by Republican Richard Nixon. His presidency marked the high tide of modern liberalism in the United States. 5.2.1 Background and Gulf of Tonkin Resolution. Johnson concentrated decision-making in his greatly expanded White House staff. Many of the most prominent Kennedy staff appointees, including Ted Sorensen and Arthur M. Schlesinger Jr., left soon after Kennedy's death. Moyers quickly rose into the front ranks of the president's aides and acted informally as the president's chief of staff after the departure of Jenkins. The American public was generally supportive of the Johnson administration's rapid escalation of U.S. military involvement in South Vietnam in late 1964.
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