text: In many states, the electors who vote for president are not required to vote for who won in the state they represent, says Plumer. An elector could decide, "I dont like who won, so I'll vote for this other candidate". One could say, since a party will choose its electors, that it will hardly ever happen, says Posner. It's true, but it shouldn't ever be able to happen, and it has happened. Plumer points out, that several times in America's past, electors have defied the will of the people. It is impossible to be completely sure of someone's loyalty.