The Electors shall meet in their respective states, and vote by ballot for President and Vice-President, one of whom, at least, shall not be an inhabitant of the same state with themselves;

Dumbass John Roberts of Fox, If two people run from the same state, that's state electoral votes can't go for that candidate, So with South Carolina, that's kinda fucking stupid to do that.
You could have two Republican Californians as that wouldn't matter but not for South Carolina.