I don’t think NC is really that close. AA turnout is down. African Americans made up 28% of the electorate in 2012 (when Romney won by 2%), and so far in early voting, they are only making up 22% of the electorate. Since African-Americans vote overwhelmingly Dem, that 6% is almost a 6% drop in votes for Hillary on election day.
This is a good site for NC voting. AA is down and white is up slightly. However, the disparity between Democrats and Rwpublocans early voting means it is going to be close.
http://www.oldnorthstatepolitics.com/