So the NC ballot bans marriage and civil unions?
Nate Silver wrote a very detailed post about how there is a real difference between ballot initiatives to ban gay marraige vs. civil unions. Bassically, a bill that ONLY bans gay marriage is far more likely to pass. A bill that bans civil unions is less likely to pass.
Unfortunately, his predictions say that NC will probably vote to ban gay marraige/civil unions:
http://fivethirtyeight.blogs.nytimes.com/2011/06/29/the-future-of-same-sex-marriage-ballot-measures/