Procedural Polarization: How Election Rules Shape Voters’ Confidence

Prior research demonstrates voters’ confidence in elections depends on whether their preferred candidate wins, but does agreement with the electoral rules being used also matter? Leveraging growing procedural polarization in election laws, public opinion data from 2008 to 2024, and a large-scale survey experiment conducted before the 2024 election, I show that agreement with election procedures matters for voter confidence beyond well-established effects related to partisan control and electoral outcomes. Observational and experimental analyses consistently reveal that voters are less likely to express confidence in election results conducted using procedures they oppose. The effects are particularly large for voter identification laws and among Republicans and independents. The findings underscore a tension in American federalism: as states increasingly adopt divergent electoral rules aligned with co-partisan preferences, partisan divides in electoral confidence may deepen. If so, procedural responsiveness to partisan preferences may undermine electoral confidence and, in turn, perceptions of electoral legitimacy.