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.
Actually, Truman was grandfathered in based on when the 22nd was passed and he was eligible to run in 1952. In fact, he did, and he lost the NH primary to Kefauver, and then he announced he would not run for reelection. Remember that while Truman is rightly looked upon incredibly favorably now, he was incredibly unpopular toward the end of his presidency. So, if he somehow managed to win the nomination, he would have had no shot in the general, especially against Eisenhower.
