In the PPP poll on October 25, 2012 (
http://www.publicpolicypolling.com/pdf/2011/PPP_Release_NC_1025.pdf), so exactly 4 years ago, they found Barack Obama with a 57/42 advantage over Mitt Romney among those who already voted (Romney won the state 50/48), and Walter Dalton with a 49/44 advantage over Pat McCrory (who won the state 55/43). Thus, both Republican candidates overperformed their current margins by 17 points in the final election.
This is a
scary precedent for the current crop of Republicans, since unless they can manage to improve more markedly than they did 4 years ago, Clinton will win NC
by 9 points, along with Ross+1 and Cooper+10.