Final answer:
The context of the '64 election was influenced by President Johnson's choice not to seek reelection amidst Vietnam War and domestic unrest.
Explanation:
The context of the 1964 election was shaped by the aftermath of President Johnson's decision not to seek reelection in March 1968. This decision, which was unprecedented in modern American politics, influenced the upcoming election significantly. Candidates like Vice President Hubert Humphrey, Republican Richard Nixon, and third-party challenger George Wallace played crucial roles in the election, amidst the backdrop of the Vietnam War and domestic unrest.
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