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(Pew Research Center)

Pew Research Center conducted this study to understand how errors in correctly representing the level of support for Joe Biden and Donald Trump in preelection polling could affect the accuracy of questions in those same polls (or other polls) that measure public opinion on issues. Specifically, if polls about issues are underrepresenting the Republican base the way that many 2020 preelection polls appeared to, how inaccurate would they be on measures of public opinion about issues? We investigated by taking a set of surveys that measured a wide range of issue attitudes and using a statistical procedure known as weighting to have them mirror two different scenarios. One scenario mirrored the true election outcome among voters (a 4.4-point Biden advantage, and another substantially overstated Biden’s advantage (a 12-point lead). For this analysis, we used several surveys conducted in 2020 with more than 10,000 members of Pew Research Center’s American Trends…

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