Makes selection of one's Electors more important, I'd suggest. iirc, States create a group of Electors for each party who would represent the winning popular vote.  As such, IF one Elector votes differently, which votes does it compromise?  Perhaps the group of Electors really individually represent Districts associated with the actual reps for Congress. Then their Electoral vote could be tied to a particular set of votes.  That's starting to sound right. And, seems it may align with a Representative Republic over simple Democracy.