Twenty-second Amendment to the United States Constitution
Since coming into force in 1951, the amendment has applied to six presidents who have been elected twice: Dwight D. Eisenhower, Richard Nixon, Ronald Reagan, Bill Clinton, George W. Bush, and Barack Obama. It has also applied to two who entered office intra-term due to their predecessor's death or resignation: Lyndon B. Johnson and Gerald Ford. Johnson became president in November 1963, following the assassination of John F. Kennedy, served out the final of Kennedy's term, and was elected to a full four-year term in 1964. Four years later, he briefly ran for a second full term, but withdrew from the race during the party primaries. Had Johnson served a second full term – through January 20, 1973 – the total length of his presidency would have been ; as it happened, Johnson died two days after this date. Gerald Ford, who became president in August 1974 following the resignation of Richard Nixon, served the final of Nixon's term, and attempted to win a full four-year term in 1976, but was defeated by Jimmy Carter. Johnson was eligible to be elected to two full terms in his own right, as he had served less than two years of Kennedy's unexpired term, whereas Ford was eligible to be elected to only one full term, as he had served more than two years of Nixon's unexpired term.
2020 United States presidential election
Article Two of the United States Constitution states that for a person to serve as President of the United States the individual must be a natural-born citizen of the United States, at least 35 years old and a United States resident for at least 14 years. Candidates for the presidency typically seek the nomination of one of the various political parties of the United States, in which case each party develops a method (such as a primary election) to choose the candidate the party deems best suited to run for the position. The primary elections are usually indirect elections where voters cast ballots for a slate of party delegates pledged to a particular candidate. The party's delegates then officially nominate a candidate to run on the party's behalf. The nominee then personally chooses a vice presidential running mate to form that party's presidential ticket (with the exception of the Libertarian Party, which nominates its vice presidential candidate by delegate vote regardless of the nominee's preference). The general election in November is also an indirect election, where voters cast ballots for a slate of members of the Electoral College; these electors then directly elect the President and Vice President.