Varieties of Electoral Dominance

Dominant political parties rule for prolonged periods of time by winning successive multiparty elections. However, the term “dominant party” encompasses an extremely diverse set of parties, ranging from ones winning unremarkable vote shares in established democracies to those garnering massive popular majorities in free but unfair elections. To grapple with such heterogeneity, this article proposes a three-part typology based on the foundations of a party’s electoral dominance—whether extremely high votes shares, steadfast support from legislative allies, or a favorable translation of votes into seats or office. These three types are internally homogenous but distinct from one another in ways predicted by the typology. The puzzles posed by each dominant-party type and the kinds of answers required to address those puzzles differ markedly.