Twenty-second Amendment to the United States Constitution
The amendment prohibits any individual who has been elected president twice from being elected again. Under the amendment, an individual who fills an unexpired presidential term lasting greater than two years is also prohibited from winning election as president more than once. Scholars debate whether the amendment prohibits affected individuals from succeeding to the presidency under any circumstances or whether it only applies to presidential elections.
Paul Wellstone
In 1999, Wellstone formed an exploratory committee to run for President of the United States in the 2000 election. After campaigning in the early primary states, he announced he would not seek the presidency because of sustained physical limitations from a college wrestling injury. His condition was later diagnosed as multiple sclerosis. As Senator, Wellstone authored the Wellstone Amendment for the Bipartisan Campaign Reform Act of 2002. His efforts toward campaign finance reform were posthumously overturned in 2010 by the U.S. Supreme Court in "Citizens United v. Federal Election Commission". In 2002, he was the only Senator facing reelection to vote against the congressional authorization for the Iraq War.