Abstract:Partisan sorting by social groups is believed to increase affective polarization and decrease group-level leverage in representation. Mounting evidence suggests that social groups are increasingly polarized in voting behavior, but how reliable are demographic labels as predictors of vote choice? We test for demographic sorting, using public opinion surveys between 1952-2020 and applying tree-based machine learning models to calculate out-of-sample predictions of presidential voting decisions. We calculate pred… Show more
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