Which was the only presidential election in which the Gallup poll erred badly?

Name: Which was the only presidential election in which the Gallup poll erred badly?
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The Gallup poll famously predicted a win for Republican candidate Thomas E. Dewey in the 1948 presidential election, with incumbent Democrat Harry S. Truman trailing by significant margins in the polls. However, Truman went on to win the election by a narrow margin, making this an example of a major polling error.

Which Was the Only Presidential Election in Which the Gallup