There is no doubt that partisanship is a powerful influence on democratic political behavior. But there is also a lively debate on its nature and origins: Is it largely instrumental in nature and shaped by party performance and issues stances? Or is it basically a long-standing expressive identity reinforced by motivated reasoning and strong emotions? We assess the nature of partisanship in the European context, examining the measurement properties and predictive validity of a multiitem partisan identity scale included in national surveys conducted in the Netherlands, Sweden, and the U.K. Using a latent variable model, we show that an eightitem partisan identity scale provides greater information about partisan intensity than a standard single-item and has the same measurement properties across the three countries. In addition, the identity scale better predicts in-party voting and political participation than a measure of ideological intensity (based on both leftright self-placement and agreement with the party on key issues), providing support for an expressive approach to partisanship in several European democracies.

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Partisanship has a powerful influence on political behavior in the United States, but its influence is less certain in European democracies. Part of the debate concerning the influence of partisanship in Europe centers on its nature. From one perspective, partisanship is seen as grounded in factors such as ratings of government performance and agreement with the party's issue stances. We refer to this as the instrumental model. In the United States, however, a competing model has gained empirical support in which partisanship is defined as an identity that is largely defensive in nature and not especially reactive to ongoing events. We refer to this as an expressive model. In this review, we focus on several European democracies (the United Kingdom, Netherlands, Sweden, and Italy) and evaluate evidence for and against an expressive model of partisanship in which democratic citizens act to defend their party in order to maintain its positive standing. We find evidence that strong partisans in Europe exhibit five characteristics of expressive partisans: stable partisan identity, motivated reasoning in defense of the party, the greater influence of identity than issues and ideology in shaping vote choice and political behavior, affective polarization bias in favor of one's own party, and the existence of strong defensive emotions aroused by partisan threats and reassurances. It appears that partisans in the four European democracies act in similar ways to partisans in the United States. Nonetheless, levels of partisan identification differ across the European nations and between European nations and the United States helping to explain national differences in the intensity of partisan behavior.

Partisan bias and hostility have increased substantially over the last few decades in the American electorate, and previous work shows that partisan strength and sorting help drive this trend. Drawing on insights from moral psychology, however, we posit that partisan moral convictions heighten affective polarization beyond the effects of partisanship, increasing partisan animosity and copartisan favoritism. Testing this theory using data from two national samples and novel measures of affective polarization in everyday life, we find that people who tend to moralize politics display more partisan bias, distance and hostility, irrespective of partisan strength. These results shed light on a different moral divide that separates the American public and raise key normative questions about moral conviction and electoral politics.

Partisanship remains a powerful influence on political behavior within developed and developing democracies, but there remains a lively debate on its nature, origins, and measurement. In this debate, political scientists draw on social identity theory to clarify the nature of partisanship and its political consequences in the United States and other developed and developing democracies. In particular, social identity theory has been used to develop an expressive model of partisanship, which stands in contrast to an instrumental model grounded in ideological and policy considerations. Included here are a discussion of the key motivational and cognitive components of social identity theory and an explanation of how the theory can be applied to the study of partisanship. The focus is on the measurement of partisanship, its social nature, its origins in convergent identities, and its ability to generate strong emotions and drive political engagement. Lastly, areas for future partisanship research are discussed. These areas include the study of negative partisan identities, coalitional identities in multiparty systems, and the political situations in which expressive and instrumental aspects of partisanship are most common.