Presidential elections were held in the United States on November 3, 1964, less than a year following the assassination of John F. Kennedy, who won the previous presidential election. The Democratic ticket of incumbent President Lyndon B. Johnson and Senator Hubert Humphrey defeated the Republican ticket of Senator Barry Goldwater and Congressman William E. Miller in a landslide victory. Johnson won 61.1% of the popular vote which, to date, remains the highest popular vote percentage of any candidate since the advent of widespread popular elections in 1824.
Johnson took office on November 22, 1963, following Kennedy's assassination, and generally continued his policies, except with greater emphasis on civil rights. He easily defeated a primary challenge from segregationist Alabama Governor George Wallace to win the nomination. At the 1964 Democratic National Convention, Johnson selected liberal Minnesota Senator Hubert Humphrey as his running mate. In the narrow Republican contest, conservative Arizona Senator Barry Goldwater defeated liberal New York Governor Nelson Rockefeller and Pennsylvania Governor William Scranton.