As president John Kennedy won the 1960 election, and was assassinated during his first term in office the question of Kennedy loosing an election does not rise.
Yes, he lost in 1960 against John F. Kennedy.
The youngest person to ever run for president and lose was John Breckinridge in 1860. He was 36 years old at the time of the election.
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No, John F. Kennedy's wife, Jacqueline Kennedy, did not lose a child while living in the White House. She had two children during her time as First Lady, Caroline Kennedy, born in 1957, and John F. Kennedy Jr., born in 1960.
Nixon lost to John Kennedy in 1960.
Richard M. Nixon lost to John F. Kennedy in the 1960 Presidential election.
In 1832 Lincoln ran for the Illinois Legislature and lost.
Eisenhower did not lose his re-election, he served two full terms. He actually had a record win with 58% popular vote and he won over 41 states.
When he was 17, he went to a brothel in Harlem and lost his virginity to a prostitute. Attaboy!
He lost the 1962 Presidential Election to John Kennedy by a ridiculously small margin (about 0.2% of the popular vote), then in 1962 lost the campaign for Governor of California and withdrew from politics for about 6 years, before coming back to be elected as President.
yes, in 1979 the conservatives won the election and had a minority government so he resigned from politics but shortly after he was given another shot with a majority government.
Patrick Bouvier Kennedy, August 7, 1963 - August 9, 1963