I'm pretty sure Northam put out Presidential numbers with blacks against E.W Jackson. 
A better example would be Maryland in 2006. Michael Steele pulled 25% of the black vote against Cardin.
Also from 2006, Ken Blackwell got 20% against Strickland. For comparison, DeWine got 15% in the Senate race.
I'd be interested in SC-Sen (Tim Scott) and LA-LG (Elbert Guillory) coming up.
Blackwell's numbers are particularly impressive considering how bad he got shellacked. Put another way, his percentage of the black vote was over half his overall percentage.
