Party Politics, Ahead of Print.
The issue positions of political actors are often ambiguous, resulting in uncertainty on the part of voters. Such ambiguity constitutes a challenge to representation, as it prevents voters from getting a clear understanding of parties’ positions. Ironically, despite growing interest in the concept, the concept itself is remarkably ambiguous: different studies use different conceptualisations of ambiguity, which hampers theory integration. This paper proposes a three-dimensional conceptualization of ambiguity: party positions are ambiguous to the extent that parties deemphasize them, remain vague or inconsistent on them. A review of 103 studies establishes the prevalence of these three dimensions in the literature, shows that most studies focus on a single dimension, and reveals lacunae in the current research on ambiguity. Based on the three-dimensional conceptualisation, the paper then develops a preliminary framework on the causes of ambiguity, outlines key gaps in the literature and suggests promising avenues of theory development.