Three ways to correct a poll’s political balance: weight on self-reported party affiliation, self-reported past vote, or voter file data such as party registration. Each has strengths and weaknesses. No one approach is clearly superior in all contexts.

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Almost 70% of national polls in 2024 were weighted on party affiliation or past vote. Weighting by party can be controversial. But evidence shows it has made polls modestly more accurate.

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