Oh I see, so it is what other people call him that matters. In that case different people will identity him based on agenda. Blacks will call him black as well as racist whites. Whites and other non blacks who don't believe a black man can be that successful will always remind that he is half white. Blacks that think he is a c00n or just don't like him will say he is mixed. Mixed people who think they have the best of both world's and want their kind to stand out will definitely sat he is biracial. When talking about the Prez race, there will always be that agenda present.
if obama were the most pro-black nikka alive, he'd still be biracial. same goes for frederick douglass or anyone else that has a white parent