George Gallup

George Gallup is presented as one of the country’s leading public-opinion specialists, and as a central figure in the mistaken forecasts of the 1948 presidential election. His final poll put Dewey well ahead of Harry S. Truman; the result made Gallup’s failure to anticipate Truman’s victory a striking measure of how quickly public opinion—and voters’ decisions—could change.

Identity and Public Role

The account identifies Gallup through his work as a pollster rather than through personal or biographical detail. In the closing days of the 1948 campaign, his findings helped shape a confident expectation that Dewey would win. That forecast made Gallup part of a wider group of experts whose apparent authority was overturned by the election result.

The Final Forecast

Gallup’s last poll showed that Truman had narrowed Dewey’s lead, but still put Dewey ahead by five percentage points: 49.5 percent to Truman’s 44.5 percent. The betting odds likewise favored Dewey, generally at four to one. The poll did not stand alone: newspapers and magazines anticipated a Dewey victory, and other commentators treated his succession to the presidency as all but settled. In that atmosphere, Gallup’s numbers reinforced rather than disrupted the prevailing expectation.

A Missed Turn in the Campaign

After Truman won, Gallup and Elmo Roper were openly bewildered by how wrong the forecasts had been. Gallup acknowledged that he could not explain the error. Later studies offered a more specific account: the polls had been reasonably accurate up to mid-October, when Gallup completed the final survey used for his election forecast. By the time that forecast appeared just before election day, its information was about two weeks old. The timing mattered because the campaign’s decisive movement apparently came in those final two weeks. Many voters who expected Dewey to win nevertheless went to the polls and voted for Truman. In Ohio, voters interviewed by a reporter had not expected Truman’s victory, yet people from mines, mills, and farms had made their choice quietly and cast their ballots for him. The discrepancy was therefore not simply between a poll and an election-day mood: it reflected a change that the last survey had no opportunity to register.

Narrative Significance

Gallup’s role in the story is less that of a political actor than of a test of expert knowledge. His forecast gave numerical precision to a widespread belief in Dewey’s inevitable victory, while the later explanation shifts attention from polling’s general accuracy to the age of the data and the late movement of voters. Truman’s win overturned the authority attached to the forecast, but the retrospective account does not reduce the error to polling alone: it emphasizes how quickly the electorate moved beyond what the final survey could show.