If there is only one seat in play in NC, there is no great shakes comeing to the congress.
NC is an individual story ... the incumbent Dems generally do a good job piling up conservative votes when it won't affect the outcome, the districts are gerrymandered, and the GOP bench is weak. Democrats have controlled the state for over 100 years and NC hasn't yet had the breakthrough most other Southern states have. That breakthrough is likely coming this year, but to take the NC House, Senate, AND a couple of congressional districts is a lot to handle with only so much $$ to go around.