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.
Barack Obama's farewell address
In the 2016 presidential election, Obama was ineligible to seek reelection to a third term due to the restrictions of the Twenty-second Amendment. In June 2016, Obama endorsed his former Secretary of State, Hillary Clinton, to succeed him as president. He addressed the 2016 Democratic National Convention on July 27 in support of Clinton as the Democratic Party's nominee, and continued to campaign for her throughout the 2016 general election campaign season. However, Hillary Clinton would unexpectedly lose the general election to Republican nominee Donald Trump on November 8, after failing to receive enough votes in the Electoral College, despite receiving a plurality of the national popular vote. The Democratic Party would no longer control the presidency once Trump was inaugurated on January 20, 2017, and they did not have a majority of seats in either chamber of the United States Congress, and in the state legislatures and governorships. President Obama's approval ratings were nearly at 60 percent at the time of his farewell speech.