I got into a discussion with some black co-workers a while back on this. They assured me that the boy is Black, that any race that is mixed with Black automatically defaults to Black. In the end, I had to agree with them. Once you go black, you don't go back is true.
Any other genuine black guy that is well educated and speaks fluent english would be called "white" in a derogatory manner by many of Obama's voters. But if you're the president the rules seem to change.