Why was Mitt Romney booed at the NAACP convention?

Mitt Romney spoke at the NAACP convention today and he took the same message to the crowd that he has been saying on the stump. He has promised to repeal Obamacare. For stating his truth he was rewarded with boos. I admire the fact that he came to the convention, and I also admire the fact that he did not pander to the crowd. He said what he has been saying and knew the likely outcome of his remarks, but he came anyway. If he had skipped the convention he would have been accused of snubbing them. He stood by his talking points in spite of the boos but he came and that counts for something.