One more constrained than the other: Asymmetrical ideological alignment and its implications for polarization

Abstract This study examines the ideological alignment of beliefs within opposing partisan camps in Europe. Integrating multiple types of research, I hypothesize that partisans on the ideological left exhibit greater alignment in their beliefs compared to those on the right – an asymmetry that extends across various issues. I argue that on the scale of ideological contention, it matters if partisans on one ideological pole are more aligned in beliefs than those on the other. Only the less ideological of opposing camps determines the extent of mutual disagreement. Utilizing conventional methods and innovative belief network modelling, I analyse survey data from the fourth and eighth waves of the European Social Survey (2008, 2016). To test the hypothesis, I match partisans with the data on their party's ideology, covering partisans from 131 parties in 15 European countries to test this hypothesis. My findings reveal that, both at the European level and within national contexts, there is a broad and substantive asymmetry between the right and the left across ideological dimensions and issues. However, the study also uncovers the limits of this asymmetry, highlighting a significant shift in ideological alignment on sociocultural issues on the right, indicating the emergence of a deeper, broader ideological conflict in that dimension. Furthermore, my analysis demonstrates the marginal influence of strategies like position blurring and programmatic nicheness. These insights shed light on the nature of partisan contention in Europe and how it disproportionately depends on ideological alignment on the right.