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In latent scaling applications, such as the positioning of political parties, differential item functioning (DIF) may occur because of measurement issues or because of substantive differences in the association between latent and manifest variables. While the first source of DIF has received considerable attention, the second has not, although it is of potential interest to comparative scholars. In this research note, we introduce a novel hierarchical Bayesian item response model that allows us to disentangle different sources of DIF. Drawing on the 2019 Chapel Hill Expert Survey (CHES), we highlight how the same issues are unequally politicized across Western Europe, and how some issues are less ideologically determined than others. Our model can be adapted to alternate settings, allowing researchers to shine a light on variation in, e.g., ideology, issue politicization, or party competition.

Western Europe is experiencing growing levels of political polarization between parties of the New Left and the Far Right. In many countries, the socio-structural foundations of this divide (class, education, residence) are by now so clear that many interpret this divide as a fully mobilized new electoral cleavage. At the same time, observers have highlighted a growing fragmentation of party systems and the proliferation of new competitors. We suggest to make sense of these contradic- tory developments by focusing on the shared group identities that constitute the “glue” of cleavage formation translating grievances into political antagonisms. Our contribution relies on data from an original online survey fielded in France, Germany, the UK and Switzerland. Respondents an- swered questions on their sense of belonging to a series of social groups, electoral preferences and socio-demographics. On this basis, we are able to show – observationally – that socio-structural categories relate to both socio-economically (e.g. class) and socio-culturally (e.g. cosmopolitanism, lifestyle) connoted group identities, which divide New Left and Far Right voters in surprisingly similar ways across contexts. We then study the extent of social closure and political mobilization at the extremes of the new divide through the analysis of social networks, perceived group align- ments, and perceived representation. Our findings suggest that the new conflict is firmly rooted in socio-economic categories and at the societal level. Its political mobilization happens mostly via culturally connoted identities. What is more, social realignments and closure are highly similar across the four countries. This underscores that party competition remains rooted in structural an- tagonisms even as support for individual parties becomes more volatile. To detect this underlying similarity and stability, it is necessary to focus on voter alignments to ideological party blocs, rather than individual parties

Heuristics have rapidly become a core concept in the study of political behavior. The term heuristic stems from the ancient Greek heuriskein, which means “to discover.” In psychology and political science, the term is used to describe cognitive shortcuts in decision making under uncertainty. The key idea is that decision makers with limited time, information, or resources use such shortcuts, thereby bypassing a certain amount of information to reach appropriate decisions. In this sense, heuristics contrast with classical rational choice. Using heuristics allows efficient decision making but can lead to biases, errors, and suboptimal decisions. Heuristics allow decision makers to draw inferences, to fill in information gaps, and to form an impression of the decision at hand. Indeed, they may be the only way to come to grips with uncertainty, especially when a decision is urgent. In political science, the concept of heuristics, originating in mathematics, economics, and psychology, has long been hailed as a possible remedy to citizens’ lack of political knowledge. Citizens participate in democratic decisions, but these decisions often pose high cognitive and informational demands. Ideally, citizens with little information about a political issue or about a candidate could use heuristics in order to reach decisions resembling those of their more well-informed peers. More recently, however, the possible biases introduced by reliance on heuristics, in particular partisan bias and a lack of consideration of different alternatives, has received more attention. Moreover, some studies show that heuristics can be used most efficiently by voters who are relatively well informed and highly interested in politics. The question of whether, or under which circumstances, heuristics can be a useful tool for democratic decision making has not yet been answered conclusively.

Politics is a complex affair. Whether one is a legislator or a citizen, making political decisions is rarely easy. The question of how people deal with this complexity has been on the minds of scholars for decades, if not centuries. One important answer, which emerged in the 1970s, is that decision makers rely on heuristics to tame the intricacies of politics. Heuristics are (cognitive) shortcuts that allow decision makers to bypass a great deal of information while producing an output in the form of a judgment or choice. Often such outputs are indistinguishable from what a complete consideration of the decision-relevant information would have produced. At other times the outputs may not be optimal, but they are good enough. It can also happen, however, that heuristics introduce formidable biases and result in inferior decisions. This chapter reviews the literature on heuristics use by the mass public and political elites. It discusses the kinds of heuristics that are used, how they function, and why they are both inevitable and fallible. Finally, the chapter considers the normative implications of heuristics in political behavior.

We present a model of deliberative inclusion, focusing on reciprocity in the interaction between structural minorities/disadvantaged groups and majorities/privileged groups. Our model, however, comes with a ‘friendly amendment': we have put the ‘burden of reciprocity' mainly on majorities and privileged groups. It is mainly their obligation to seriously listen and respond to the demands and arguments of minorities and disadvantaged groups and show a willingness to respect and accommodate these interests. Empirically, we apply our model to the interaction of linguistic groups in the Swiss parliament. We find a highly egalitarian, sometimes even minority-favoring mode of interaction between the German-speaking majority and linguistic minorities. The German-speaking majority seems to be willing to take the ‘burden of reciprocity' when linguistic minorities' vital interests are concerned. Conversely, linguistic minorities are slightly more self-referential and adversarial under such conditions