When a president gets elected in a year with a "0"

Look what happens when a President gets elected in a year with a "0" at the end. Also notice it goes in increments of 20 years.

1840: William Henry Harrison (died in office)
1860: Abraham Lincoln (assassinated)
1880: James A. Garfield (assassinated)
1900: William McKinley (assassinated)
1920: Warren G. Harding (died in office)
1940: Franklin D. Roosevelt (died in office)
1960: John F. Kennedy (assassinated)
1980: Ronald Reagan (survived assassination attempt)
2000: George W. Bush ????????????

And to think that we had two guys fighting it out in the courts to be the one elected in 2000.

And, have a history teacher explain this----- if they can:

Abraham Lincoln was elected to Congress in 1846.
John F. Kennedy was elected to Congress! s in 1946.
Abraham Lincoln was elected President in 1860.
John F. Kennedy was elected President in 1960.
Both were particularly concerned with civil rights.
Both wives lost their children while living in the White House.
Both Presidents were shot on a Friday.
Both Presidents were shot in the head.
Lincoln's secretary was named Kennedy.
Kennedy's Secretary was named Lincoln.
Both were succeeded by Southerners named Johnson.
Andrew Johnson, who succeeded Lincoln, was born in 1808.
Lyndon Johnson, who succeeded Kennedy, was born in 1908.
John Wilkes Booth, who assassinated Lincoln, was born in 1839.
Lee Harvey Oswald, who (supposedly!) assassinated Kennedy, was born in 1939.
Both assassins were known by their three names.
Both names are composed of fifteen letters.
Lincoln was shot at the theater named 'Ford'.
Kennedy was shot in a car called 'Lincoln' made by 'Ford'.
Booth and Oswald were assassinated before their trials.

And here's the kicker:

A week before Lincoln was shot, he was in Monroe, Maryland
A week before Kennedy was shot, he was with Marilyn Monroe.