I think all of the presidents would have won a third term.
Just for your information: In 1920, there was no term limit (the 22nd amendment was enacted in 1951).
In 1920, TR would likely have been the nominee, had he lived.
Former President Theodore Roosevelt/Senator Robert LaFayette 429 EV. 61.6%Governor James M. Cox/Governor Al Amith 102 EV. 32.9%So 1960, Eisenhower defeats JFK. JFK does better than Stevenson in 1952 and 1956, but still loses.
President Dwight D. Eisenhower/Vice President Richard Nixon 368 EV. 53.8%Senator John F. Kennedy/Senator Lyndon B. Johnson 169 EV. 44.1%In 1988, President Reagan easlily wins a third term:
President Ronald Reagan/Vice President George Bush 452 EV. 54.7%Governor Michael Dukakis/Senator Llyod Bentson 86 EV. 42.6%And 2000, Bill Clintons wins by a close margin:
President Bill Clinton/Vice President Al Gore 298 EV. 49.5%Governor George W. Bush/Fmr. Defense Secretary Dick Cheney 240 EV. 47.9%The election of 1952, with President Harry S. Truman, would be interesting, too.