Apparently Sen. Obama is black.
When asked by Kroft if growing up in a white household had caused him to make a decision to be black, Obama replies, "I'm not sure I decided it. I think … if you look African-American in this society, you're treated as an African-American. It's interesting though, that now I feel very comfortable and confident in terms of who I am and where I stake my ground. But I notice that … I've become a focal point for a racial debate."
Obama's wife also addresses the race issue when asked by Kroft whether she fears for her husband’s life as a black candidate. "I don't lose sleep over it because the realities are that … as a black man … Barack can get shot going to the gas station," says Michelle Obama. "You can't make decisions based on fear and the possibility of what might happen."
(emphasis by me)
UPDATE: You may have seen Debra Dickerson on Colbert Thursday night, pushing this silly thesis she wrote about here on Salon. Based on her theorizing and I guess a newfangled purity test, someone like myself isn't african-american/black (because my ancestors were slaves in Jamaica and not in the USA). But yet, there I am in the mirror, black like Barack.