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.
1796 United States presidential election
With the retirement of Washington after two terms, both parties sought the presidency for the first time. Before the ratification of the 12th Amendment in 1804, each elector was to vote for two persons, but was not able to indicate which vote was for president and which was for vice president. Instead, the recipient of the most electoral votes would become president and the runner-up vice president. As a result, both parties ran multiple candidates for president, in hopes of keeping one of their opponents from being the runner-up. These candidates were the equivalent of modern-day running mates, but under the law they were all candidates for president. Thus, both Adams and Jefferson were technically opposed by several members of their own parties. The plan was for one of the electors to cast a vote for the main party nominee (Adams or Jefferson) and a candidate besides the primary running mate, thus ensuring that the main nominee would have one more vote than his running mate.