Elite partisan polarization has been found to have several potentially problematic effects on citizens, such as creating political distrust and different types of polarization among partisans. However, it remains unclear whether these effects are caused by the parties moving apart in terms of issue positions (issue polarization) or by the rise of disrespectful rhetoric (incivility). In the literature, these two dimensions of elite polarization often appear to affect citizens in similar ways, but typical research designs have not been well suited to disentangling their effects. To determine their unique effects, four studies have been conducted using original designs and a mix of experimental and observational data. The results show that issue polarization and incivility have clearly distinct effects. A more uncivil tone lowers political trust, but increasing issue polarization does not. Conversely, only issue polarization creates attitude polarization among partisans. Both aspects of elite polarization create affective polarization.

Several theoretical perspectives suggest that when individuals are exposed to counter-attitudinal evidence or arguments, their pre-existing opinions and beliefs are reinforced, resulting in a phenomenon sometimes known as ‘backlash’. This article formalizes the concept of backlash and specifies how it can be measured. It then presents the results from three survey experiments – two on Mechanical Turk and one on a nationally representative sample – that find no evidence of backlash, even under theoretically favorable conditions. While a casual reading of the literature on information processing suggests that backlash is rampant, these results indicate that it is much rarer than commonly supposed.

Researchers have sought to understand the effects of like-minded versus contrary news exposure on attitude polarization, which can be a threat to democracy. The online news environment offers opportunities for exposure to both types of news, albeit unequally. This study tests the effects of exposure to heterogeneous partisan news bundles (both like-minded and contrary news) on attitude polarization. Because media exposure can lead to bias, attitude polarization is tested as a direct and indirect effect via hostile media perceptions. Data in this study are from a between-subjects experimental design about the issue of assisted suicide. Results indicate that even though the effect of the partisan news bundle on hostile media perceptions is significant, both direct and indirect effects on attitude polarization are null.