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AmericanPoliticalScienceReview(2020)114,2,392–409doi:10.1017/S0003055420000052©AmericanPoliticalScienceAssociation2020DemocracyinAmerica?Partisanship,Polarization,andtheRobustnessofSupportforDemocracyintheUnitedStatesMATTHEWH.GRAHAMYaleUniversityMILANW.SVOLIKYaleUniversityIssupportfordemocracyintheUnitedStatesrobustenoughtodeterundemocraticbehaviorbyelectedpoliticians?Wedevelopamodelofthepublicasademocraticcheckandevaluateitusingtwoempiricalstrategies:anoriginal,nationallyrepresentativecandidate-choiceexperimentinwhichsomepoliticianstakepositionsthatviolatekeydemocraticprinciples,andanaturalexperimentthatoccurredduringMontana’s2017specialelectionfortheU.S.House.OurresearchdesignallowsustoinferAmericans’willingnesstotrade-offdemocraticprinciplesforothervalidbutpotentiallyconflictingconsiderationssuchaspoliticalideology,partisanloyalty,andpolicypreferences.WefindtheU.S.public’sviabilityasademocraticchecktobestrikinglylimited:onlyasmallfractionofAmericansprioritizedemocraticprinciplesinthei...