Truman was super unpopular is 1952, bottoming out at 22%, but many people weren't to keen on the Isolationist Taft running, fearful of letting the Soviet Union go unchecked. Could Truman hold together his party long enough for 4 more years? Or is America just exhausted after 20 years of Democrats in the White House, giving Taft the Presidency/kicking Truman out in the Primaries?
Any POD you want, mine is he doesn't criticize the Nuremberg Trials (which alot of people across the aisle hated him for) and/or Eisenhower has Health Problems severe enough that prevent him from running.