There's also an elitist wing of the Republican party that, if it doesn't dislike blacks, is scared of them. You're not going to get many votes in a district if you won't even show up in the neighborhood. Republicans will never be able to out-liberal the liberals in getting a percentage of the black vote, but I think there are many blacks who would vote Republican if they thought someone cared about their interests. This doesn't mean pushing a "black agenda" of quotas, welfare, and abortions. That plays to a black stereotype that's, if anything, more destructive than the Stepinfetchit characters common in old movies. It does mean acknowledging individuals as real live human beings and not simply demographics.
I think 30% is the breakover number, and I also think that's doable. At 30%, we start seeing black delegates at the conventions, signs in yards, and Rats seeing that the Jessie Jackson/Al Sharpton race-pimping is no longer working.
Here's the message I'd deliver: "Democrats want people broke, in projects and living on welfare because then they'll vote Democrat. We want people wealthy, in their own homes and working a good job because then they'll vote Republican."