The Democratic party in this country has (as all conservatives already know) been taking the black vote for granted since sometime around the early Bronze Age. Wasn't there some fuss, just a few months ago, regarding Nancy "The Mummy Returns" Pelosi assuming her House leadership position by ruthlessly squashing some black congressguy who got in her way, or somesuch? (I may be completely misremembering the salient details, here. Feel free to correct me, if I'm in gross error here.)
Black voters have no one to blame but themselves for this unhappy status quo, ultimately. When a woman keeps going back and going back and going back to the man who beats her, knowing full well that he's likely to beat on her again, in the not-too-distant future... that's not assault any longer. That's masochism.