Color didn't matter, unless you want to flip it around and notice that over 95% of blacks voted for Obama. You can't tell me that was just because of his track record as a U.S. Senator.
Nearly the same percentage of blacks voted for Kerry. And Gore. And Clinton, etc. etc. You can't tell me it had to do with the color of their skin.
Obama didn't change the Democratic share of black votes much from the usual 90+% share Democrats have received for decades. He switched a handful of Black Republicans (of which there was a tiny pool to begin with) like Colin Powell and that's about it.