Testing the social pressure hypothesis: Does in-party social pressure reduce out-party empathy?

Empathy is considered one of the most critical components for bridging political divides and reducing animosity between political groups. Yet, empathy between political opponents is rare. There is a growing concern that partisans do not empathize with out-partisans because they feel social pressure from fellow in-partisans not to do so. This article examines this social pressure hypothesis and draws two conclusions. First, on the surface, the hypothesis seems plausible: citizens perceive fellow in-partisans as comparatively disapproving of and reluctant to engage in out-party empathy, and naïve cross-sectional analyses suggest that this perception translates into lower empathy towards out-partisans. Second, however, experimental data suggest that this relationship is not causal. Expecting disapproval from fellow in-party members for empathizing with out-partisans does not lead to a significant reduction in intentions to empathize with out-partisans. Rather, exploratory analyses suggest that social pressure by the in-party increases empathy toward out-partisans and triggers disappointment toward in-partisans. This implies that partisans can resist social pressure from the in-party and might even compensate for in-partisans' lack of out-party empathy. The results are supported by original cross-sectional and experimental survey data ( $N=\mathrm{2,535}$ ) collected in the United States, an arguably most likely case for in-party social pressure to shape partisans' intentions. The results have important implications for understanding the causes of and viable strategies for building empathy across political divides.