Obama wasn't awarded it because of his skin color. He was awarded it because of his stated foreign policy ambitions which was in contrast to the Bush-era warmongering and ignoring of international treaties like the Geneva Convention. Of course it was a mistake to award the price based on promises before seeing the results. (I suspect they wouldn't have chosen him if they had known he wouldn't actually close Guantanamo as he promised to.) But anyway, that was the reason.

Only Americans obsess over the skin color of Obama. The Nobel committee were more concerned about thing like torturing people indefinitely at "black sites", attacking countries without UN approval and such.