The non-ideological component of coalition preferences

Recent research on political attitudes has emphasized that coalition preferences determine electoral choices, prompting scholars to investigate the sources of coalition preferences. While it is not surprising that coalition preferences are strongly informed by spatial considerations, several studies have drawn attention to additional nonideological factors. Relying on this insight, the present study aims to systematically investigate the nonideological or valence component of coalition preferences. In order to decompose attitudes into their principal ideological and nonideological components, we apply a Bayesian unfolding model to coalition sympathy ratings. We find that coalitions differ strongly with regard to their valence component. This surplus cannot be reconstructed as a linear combination of the coalitions’ constituent party valences and is predominantly structured by campaign valence.