Abraham Lincoln was elected to Congress in 1846.
John F. Kennedy was elected to Congress in 1946.

Abraham Lincoln was elected President in 1860.
John F. Kennedy was elected President in 1960.

The names Lincoln and Kennedy each contain seven letters.

Both wives lost their children while living in the White House.

Both Presidents were shot on a Friday.

Lincoln's secretary was named Kennedy.
Kennedy's secretary was named Lincoln.

Both were succeeded by Southerners called 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 assassinated Kennedy was born in 1939.

Both assassins were known by their three names, each consisting of 15 letters in total.

Booth ran from the theatre and was caught in a warehouse.
Oswald ran from a warehouse and was caught in a theatre.

Booth and Oswald were assassinated before their trials.

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