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.
Michelle Obama
Over the course of the Obama presidency, particularly during the second term, Michelle Obama was subject to speculation over whether she would run for the presidency herself, similarly to predecessor Hillary Clinton. A potential Michelle Obama candidacy was supported by both Samuel L. Jackson and James Clyburn. On April 6, 2009, CNN did a poll on whether she should run for the presidency in 2020, 83% of responders being opposed to the idea. A May 2015 Rasmussen poll found Obama had 22% of support to Clinton's 56% of winning the Democratic nomination, higher than that of potential candidates Elizabeth Warren, Martin O'Malley and Bernie Sanders. Another poll from that month found 71% of Americans believed that Obama should not run for the presidency, only 14% approving. On January 14, 2016, during a town-hall meeting, President Obama was asked if the First Lady could be talked into running. He responded, "There are three things that are certain in life: death, taxes, and Michelle is not running for president. That I can tell you." On March 16, 2016, while speaking in Austin, Texas, Obama denied that she would ever run for the office, citing a desire to "impact as many people as possible in an unbiased way". In the Epilogue to her November 13, 2018 Becoming (book) Obama writes "I have no intention of running for office, ever" recognizing that "politics can be a means for positive change, but this arena is just not for me."