From your own link, "The Supreme Court has never ruled on the constitutionality of state laws that punish electors for actually casting a faithless vote." And,

From your own link, "The Supreme Court has never ruled on the constitutionality of state laws that punish electors for actually casting a faithless vote." And, "no one faithful to our history can deny that the plan originally contemplated what is implicit in its text -- that electors would be free agents, to exercise an independent and nonpartisan judgment as to the men best qualified for the Nation's highest offices."