“We find a negative net effect of endorsement on public policy approval: the positive effect generated in party and leader´s supporters is outweighed by the growth in rejection from detractors.” Negative partisanship > partisanship
both leader & party cues affect policy preferences, strongly enough to polarize opinions over non-divisive issues. positive effects outweighed by growth in rejection from detractors; bipartisan & against-type endorsements don’t depolarize #SocSciResearch
Polarization by association? Ex nihilo?! “[policy] endorsement [by political parties] ...generate[d] a polarization in opinion among voter groups”—☝️wait for it—“even when there was previously none.”