I suspect that Mr. McCrory has some favorable views in the Mecklenberg minority community and this time around he will do better with rural whites.
I looked at the minority vote in Charlotte and here are a few notes; as usual, I used DRA.
These are the precincts I looked at; they are the most heavily majority-minority or minority-plurality in the county:
The electorate here is 52% black and hispanics and white each make up about 24% each.
McCrory got 20.3% in these precincts, which is actually worse
than the Republican average of 21%; still its better than McCain's 16%.
So, yes, minority voters may have a favorable views of McCrory, but he's support with them isn't particularly strong.
As for rural whites Dalton is now starting to emphasize his small town roots in his ads, which should help, especially in areas of NC-10 and NC-11. What will hurt Dalton is the swing in the east; Perdue was very strong with her base along the east coast (in counties like Craven, Onslow, Carteret, etc.). Those voters are ordinarily conservative voters who are liable to revert to McCrory.