Public opinion polls in the 2020 presidential election suffered from errors of “unusual magnitude,” the highest in 40 years for surveys estimating the national popular vote and in at least 20 years for state-level polls, according to a study conducted by the American Association for Public Opinion Research (AAPOR).
The AAPOR task force examined 2,858 polls, including 529 national presidential race polls and 1,572 state-level presidential polls. They found that the surveys overstated the margin between President Biden and former president Donald Trump by 3.9 points in the national popular vote and 4.3 percentage points in state polls. CONTINUED
Dan Balz, Washington Post
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