As of late, political theory, research, and practice have taken a deliberative turn, extolling the benefits of idealized public discourse. This paper explores how mass polarization impacts the preconditions for such discourse. Drawing from social identity theory, partisanship is conceptualized as having distinct, yet interrelated social and ideological dimensions. Through both online and telephone-based survey experiments, the paper then examines how these two dimensions affect attitudes toward discussion that theorists prioritize. Strong social attachments to one’s party consistently drive antideliberative attitudes toward disagreement; ideological partisan attachment, however, does not have this effect. The results suggest that the rise of social identity polarization has driven the public away from discursive norms that would support a deliberative democratic system.
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