I find that very hard to believe. Blacks didn't vote for him because they liked his policies; similarly, they won't vote against him because they dislike his policies,.
The poll results are likely to manifest themselves as another 95/5 margin for Obama among blacks...but only 75% of 2008's turnout.
But...it could be worse. Obama has done exactly nothing for the blacks. In fact, he's done far more for gays than for blacks. Their loyalty hasn't been rewarded in the slightest. And it's starting to dawn on many...