Many scholars blame partisan polarization for collapsing politics into social life. But these diagnoses lack any sophisticated theoretical basis for distinguishing “social” from “political” forms of identity. This article offers such a framework, providing better grounding for evaluating polarization. Drawing on work on the politics of difference, I first argue that the harms of polarized partisanship mirror long-standing criticisms of essentialist social identities, including the constriction of agency and reduction of compromise. I then show how a more political form of partisan identity could not only mitigate these concerns but also positively contribute to democracy through the promotion of civic republican ideals of active citizenship. I conceptualize partisan identity between the view of the social-identity literature (partisanship as cultural identity) and an idealizing tendency within some recent normative views (partisanship without identity), offering a novel evaluation of polarization and a conceptual map useful for both empirical and normative scholars.