Moving toward the Median: Compulsory Voting and Political Polarization

Abstract

Should turning out to vote in mass elections be voluntary or compulsory? Previous normative arguments for compulsory voting often rely on contested normative claims about the moral duty to vote or about the democratic legitimacy conveyed by high turnout. Our article strengthens the normative case for compulsory voting by arguing that it could improve democracy by reducing polarization, which existing work suggests can lead to democratic backsliding. Drawing on spatial models of electoral competition, we argue that, by reducing more extreme voters’ ability to threaten to abstain due to alienation, the introduction of compulsory voting can push party platforms toward the median voter’s preferences. This directly decreases party polarization, defined as the distance between party platforms. We examine potential normative and empirical objections to this argument and provide scope conditions under which compulsory voting is likely to decrease polarization.