I hope this doesn't come off as a nitpick, but Truman wasn't term limited. The amendment that put in action the two-term limit didn't apply to Truman, as it was proposed during his presidency. However, he did choose not to exploit it (since his approval ratings at the time weren't really high anyways) To refer to the wording of the section:1952, Truman is term limited since he took over early in FDR's 4th term and had served for >6 years. Eisenhower wins open election.
No person shall be elected to the office of the President more than twice, and no person who has held the office of President, or acted as President, for more than two years of a term to which some other person was elected President shall be elected to the office of the President more than once. But this Article shall not apply to any person holding the office of President when this Article was proposed by the Congress, and shall not prevent any person who may be holding the office of President, or acting as President, during the term within which this Article becomes operative from holding the office of President or acting as President during the remainder of such term.