Pulitzer-winning McCullough presidential biography (6)

I believe the answer is:

truman

(Other definitions for truman that I've seen before include "US president, 1945-53" , "Harry S ... former US president" , "The - Show, Jim Carrey film" , "33rd president of the United States, d. 1972" , "- Capote, US novelist" .)

I've seen this clue in the LA Times.

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