I wouldn't necessarily call it racism. I would call it identity politics. You raised the question if a black candidate was running for the GOP, he would get the vote of the black population. I would beg to differ.
Look at the Leaders of the GOP that happen to be black (eg. Clarence Thomas, J.C. Watts, Condy Rice, Lynn Swan, etc.). They have all been called Uncle Toms. I mean they aren't forgetting their heritage, but rather see things differently and they get attacked by the Democrat machine for being "Off the reservation," if you will.
The fact is that Democrats promise things to the minorities, and rarely finish the promise, but give them just enough to show that they "care." In this way they keep their votes locked up. Also this is the reason why the minorities (specifically blacks) don't attempt the same level of success as other minorities. They are promised these things and (may) feel like they just have to wait for someone to help them, instead of taking the initiative to get themselves up.
I am not an expert in this, but that is at least what I think.
