The American political parties are growing socially polarized. Religion and race, as well as class, geography, and culture, are dividing the parties in such a way that the effect of party identity is magnified. The competition is no longer between only Democrats and Republicans. A single vote can now indicate a person’s partisan preference as well as his or her religion, race, ethnicity, gender, neighborhood, and favorite grocery store. This is no longer a single social identity. Partisanship can now be thought of as a mega-identity, with all the psychological and behavioral magnifications
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