Yes. Franklin Pierce who was elected as a Democrat in 1852 did not get the nomination to run again in 1856. His successful Democratic successor, James Buchanan also failed to be nominated for a second term in 1856 ,but for a somewhat different reason-- the party split over slavery .
Yes. Gerald R. Ford became Richard Nixon's VP when Spiro Agnew resigned, and then moved up to President when Nixon resigned.
20
Two
American presidents who are re-elected are required to repeat the oath of office.
5 of the first 10 presidents were re-elected for a second term.
Truman, Eisenhower, Clinton were elected to a second term after losing congress in the 1st midterm. Wilson, F. Roosevelt, Johnson, Nixon, and Regan either didn't lose it or lost it after the first midterm.
It's not mandatory, but most presidents attempt it.
If a president is elected, they are alotted 2 four year terms if they are re-elected after their first term.
6
The final category was U.S. Presidents The Clue was: Of the 20 presidents elected to a second term, 2 of the 3 who failed to complete that term The answer was: Who were ABRAHAM LINCOLN, RICHARD NIXON, WILLIAM MCKINLEY (2 OF THE 3 Who FAILED TO COMPLETE THE SECOND TERM).
As a group one-term presidents are not so successful which is why they were one-term presidents. Polk refused to run for a second term and he was probably the most successful one-termer. Taft would very probably have won a second term if Theodore Roosevelt had supported him instead of breaking with with his party and running as an independent against him.
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Brazilian presidents are elected for a term of 4 years. They can be re-elected for one additional term.