Commentary: The Exceptional Catalog of Polling Failure

The question looms in nearly every U.S. presidential election, even in this year’s race: Could the polls be wrong? If they are, they likely will err in unique fashion. The history of election polling says as much.

That history tells of no greater polling surprise than what happened in 1948, when President Harry Truman defied the polls, the pundits and the press to defeat Thomas E. Dewey, his heavily favored Republican foe.

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