Thanks Joseph
I couldnt find anything about NC but apparently in MI and MN that is the case.
Interestingly in Ray v Blair the court wrote regarding states requiring a PLEDGE from electors as to whom they would vote for
(from wikipedia)
It would seem that under the constitution electors can vote for whomever they want as akuperma says. In spite of the states that have laws against it. Though is has never been challenged in court