Thats funny, because i seem to remember Shelby Steele talking about how he thought that Barack Obama was not black enough to be the first black president...
Yes, there's some backlash that he isn't "black enough". But, imagine Obama identifying as white. Both white and black voters would laugh him out of the election. "Race" is a social group. There are many "black" people who are far more lightskinned and Caucasian-looking than Obama. Both white and black people consider them black. I wish these divisions didn't exist, but they do. It's a reality that most children of mixed ancestry come up against. Again, I speak from experience here.
There's a difference between identifying as a particular "race" and being hateful toward other people. The problem with Obama isn't that he is considered black (or even half-black). The problem is the evidence suggests he is hateful toward other people.