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Weighting Polls on Party Affiliation and Past Vote

Pew says weighting on party affiliation or past vote improves political poll accuracy by 1 to 2 points per candidate, but timing and benchmark choice matter.

Summary by Pew Research Center
This report explains how political weighting works, how Pew Research Center does it, and some of its limitations.

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Weighting Polls on Party Affiliation and Past Vote

This report explains how political weighting works, how Pew Research Center does it, and some of its limitations.

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Pew Research Center broke the news on Wednesday, September 16, 2026.
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