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.
Second inauguration of Harry S. Truman
According to one analysis, the delayed arrival of members of Congress created a break in succession of Truman's terms as President. The 20th Amendment to the United States Constitution, ratified in 1933, states that a President's term ends at noon on January 20 after the election. Members of Congress arrived 10 minutes late and took another 10 minutes to take their seats. Vice President Alben W. Barkley was inaugurated at 12:23 and technically served as President for six minutes, until Truman was inaugurated at 12:29.