Conflicts of Interest The authors declare no conflicts of interest. Data Availability Statement The data that support the findings of this study are available from the corresponding author upon reasonable request. Supporting Information Filename Description gove70109-sup-0001-suppl-data.docx61.4 KB Supporting Information S1 References , and . 2018. “Negative Partisanship: Why Americans Dislike Parties but Behave Like Rabid Partisans.” Political Psychology 39, no. s1: 119–135.