This paper advances normative theorizing about political parties by highlighting concerns arising from recent empirical scholarship on marginal partisanship, affective polarization, and identity convergence. These phenomena challenge the ideal of healthy partisanship as characterized in recent democratic theory, and point toward a new theoretical agenda. I argue that democratic theorists' current focus on the virtues of mature partisanship has obscured essential questions about the scope of partisanship as an ideal and about processes of partisan socialization and mobilization.

This article joins a growing body of scholarship on political parties in arguing that democratic party politics should be concerned with avoiding the problem of factionalism. But existing responses to this problem have relied too heavily on conceptual distinctions between parties and factions. The dangers of factionalism cannot, in practice, be separated from the celebrated benefits of party politics. Both are rooted in the same aspects of social psychology. Consequently, I argue that we should understand the ideal of non-factionalism as (...) the management of a set of chronic and ineradicable concerns about how group conflict can undermine the specific forms of political unity appropriate for a liberal democracy. This ideal is negative: focused on avoiding pathological forms of party politics rather than conforming to a particular positive model. It is also plural, encompassing several related normative concerns. And it is systemic - assessed at the level of party systems. (shrink)