The three major polling organizations stopped polling well before the November 2 election date—Roper in September, and Crossley and Gallup in October—thus failing to measure the period when Truman appears to have surged past Dewey.[199][200]
In the end, Truman held his progressive Midwestern base, won most of the Southern states despite the civil rights plank, and squeaked through with narrow victories in a few critical states, notably Ohio, California, and Illinois. The final tally showed the president had secured 303 electoral votes, Dewey 189, and Thurmond only 39. Henry Wallace got none. The defining image of the campaign came after Election Day, when an ecstatic Truman held aloft the erroneous front page of the Chicago Tribune with a huge headline proclaiming "Dewey Defeats Truman."[201]

Full elected term (1949–1953)
Truman's second inauguration was the first ever televised nationally.[202]

Hydrogen bomb decision
The Soviet Union's atomic bomb project progressed much faster than had been expected,[203] and they detonated their first bomb on August 29, 1949. Over the next several months there was an intense debate that split the U.S. government, military, and scientific communities regarding whether to proceed with the development of the far more powerful hydrogen bomb.