If incumbent United States President Donald Trump fails to win the re-election, he will not be the first incumbent president in history to have fallen from grace but will be the first in last three decades.
In 1992, George H W Bush failed to win his second term as Democrat Bill Clinton won the election.
Since Bush, all three US presidents -- Bill Clinton, George W Bush (Junior), and Barack Obama -- have won their re-elections.
Only four US presidents, in the last 100 years, failed to win re-elections.
George HW Bush was one of them.
The others include Jimmy Carter, who lost out to Republican Ronald Reagan in 1980 US election.
In 1976, Republican Gerald Ford lost out to Jimmy Carter who lost it to Ronald Reagan in 1980.
Republican Herbert Hoover was defeated by Democratic Franklin D Roosevelt in 1932. It was a landslide win for Roosevelt as the election was overshadowed by the Great Depression.