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Political Polling History: How Gallup Got His Start | TIME
George Gallup - Wikipedia
How Presidential Polling Got Its Start - HISTORY
The First Measured Century: Program: Segment 7 - The Gallup Poll - PBS
Polling for United States presidential elections - Wikipedia
Gallup, Inc. - Wikipedia
Inside the Alluring Power of Public Opinion Polls From Elections Past
Favorable Ratings of Harris, Trump Remain Under 50%
George Gallup: A history of polls and pollsters blowing it before …
George Gallup | Biography, Poll, Public Opinion, & Facts