yes
Dewey never won a presidential election. I don't think he ever defeated a future president in any kind of election.
Kennedy defeated Nixon in the Presidential election of 1960.
he defeated Stephen Douglas and others for president
Gerald R. Ford in the Election of 1976.
He won by a small number of votes
(Stephen) Grover Cleavland. As an incumbant president, he lost the 1888 election to Benjamin Harrison, but defeated Harrison in the 1892 election.
He was defeated in the 1976 election by Jimmy Carter.
Adlai Stevenson
John F. Kennedy was elected president in 1960 in a very close election over Richard Nixon.
JFK defeated Nixon in 1960.
Grover Cleveland was defeated in his bid for re-election in 1888 but ran again and won in 1892. He was the only president to serve two non-consecutive terms.Martin Van Buren came close to getting the Democratic nomination in 1844 after losing his re-election bid in 1840. In 1848 he ran on the third party, Free-Soil ticket and probably tipped the election to the Whig Zachary Taylor by taking away Democratic from Lewis Cass votes in New York.