A key characteristic of democratic politics is competition between groups, first of all political parties. Yet, the unavoidably partisan nature of political conflict has had too little influence on scholarship on political psychology. Despite more than 50 years of research on political parties and citizens, we continue to lack a systematic understanding of when and how political parties influence public opinion. We suggest that alternative approaches to political parties and public opinion can be best reconciled and examined through a richer theoretical perspective grounded in motivated reasoning theory. Clearly, parties shape citizens' opinions by mobilizing, influencing, and structuring choices among political alternatives. But the answer to when and how parties influence citizens' reasoning and political opinions depends on an interaction between citizens' motivations, effort, and information generated from the political environment (particularly through competition between parties). The contribution of motivated reasoning, as we describe it, is to provide a coherent theoretical framework for understanding partisan influence on citizens' political opinions. We review recent empirical work consistent with this framework. We also point out puzzles ripe for future research and discuss how partisan motivated reasoning provides a useful point of departure for such work.
Forthcoming in Advances in Political Psychology 1 (2014).The authors thank Jamie Druckman for helpful advice. They also acknowledge support from the Danish Council for Independent Research and the Aarhus University Research Foundation (AU Ideas) as part of the POLIS Research Unit. 2
IntroductionIn a democracy, power and influence is not simply a given, it is obtained through competition and conflict waged between groups. The most important groups are often political parties who fight for public opinion as a means of winning office and legitimizing their policy activity.Although parties were not initially part of the idea of democratic politics, political elites quickly realized the need for organizing collective action and formed political parties (Aldrich 1995).Since then, political parties have proven critical to elections, and today, political parties provide the key link between citizens and democratic leadership. Political parties are fundamental to democratic competition and representation. Indeed, many see democracy as "unthinkable"without political parties (Schattschneider 1942: 1).However, despite generations of political science research on political parties and citizens, we continue to lack a systematic understanding of how political parties affect democratic representation in general and public opinion in particular. Indeed, the role of political parties in public opinion formation has engaged two major, yet unresolved debates. First, do parties lead or follow public opinion? For more than 50 years, scholars have debated if citizens evaluate parties based on their policy preferences, or parties influence citizens' policy prefere...