^ With the exception of Hagan, who's had her favorable numbers hammered down over the last year, Burr leads a bunch of Democats who each have 20-30% name recognition. I wouldn't extrapolate too much out of that in terms of Hillary.
Burr himself doesn't have much recognition, he is just a generic R who is close to 50% and leads his Democratic opponents by wide margins. Once the conservative undecideds come home, he should be safe.
This is a sample that voted the same as the actual result, Romney +2.
Which should make Democrats even more worried. You'd assume that Burr would at least be leading by 3 or 2 points, but he isn't. I doubt that Walker/Bush/Paul/Rubio will poll much worse than Burr.