George Washington
At the end of his second term, Washington retired for personal and political reasons, fatigued and disgusted with personal attacks, and to assure a truly contested presidential election could be held. He did not feel bound to a two-term limit, but his retirement ultimately set precedent. The two-term limit to the presidency was formalized with the 1951 adoption of the Twenty-second Amendment to the United States Constitution. Washington is often credited with setting the principal of a two-term presidency, but it was Thomas Jefferson who first refused to run for a third term on political grounds.
Presidency of Franklin D. Roosevelt
The two-term tradition had been an unwritten rule (until the ratification the 22nd Amendment after Roosevelt's presidency) since George Washington declined to run for a third term in 1796. Both Ulysses S. Grant and Theodore Roosevelt were attacked for trying to obtain a third non-consecutive term. Roosevelt systematically undercut prominent Democrats who were angling for the nomination, including Vice President John Nance Garner and two cabinet members, Secretary of State Hull and Postmaster General James Farley. Roosevelt moved the convention to Chicago where he had strong support from the city machine, which controlled the auditorium sound system. At the convention the opposition was poorly organized, but Farley had packed the galleries. Roosevelt sent a message saying that he would not run unless he was drafted, and that the delegates were free to vote for anyone. The delegates were stunned; then the loudspeaker screamed "We want Roosevelt... The world wants Roosevelt!" The delegates went wild and he was nominated by 946 to 147 on the first ballot. The tactic employed by Roosevelt was not entirely successful, as his goal had been to be drafted by acclamation. At Roosevelt's request, the convention nominated Secretary of Agriculture Henry Wallace for vice president. Democratic party leaders disliked Wallace, a former Republican who strongly supported the New Deal, but were unable to prevent his nomination.