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.
President of Colombia
Already the Constitution of 1991 limited presidents to a single term. However, on 24 November 2005, the Colombian Congress introduced the Electoral Guarantees Law (Ley de Garantias Electorales), which modified Article 152, of the Colombian Constitution of 1991 and allowed a president to run for a second term. The President or Vice President running for re-election must officially tell in the National Electoral Council and guarantee a fair competition for the other contenders. Participation of acting officials in political proselytism was standardized. If the president or vice president are not running for office, they are prohibited from participating on political proselytism. If one or both are participating, they can engage in political activity only four months before the primary elections. Also, if the president and/or vice president is running for office, he may participate in their political party's selection mechanism to postulate candidates. In 2010, the Constitutional Court of Colombia threw out a planned referendum to allow presidents to run for three consecutive terms. It ruled that Colombian presidents can only serve two terms, even if they are nonconsecutive. In 2015, a constitutional amendment repealed the 2004 changes and reverted to the original one-term limit.