Is the sky blue? Is Obama half black?
Actually he is a quarter black. His father was half African and half Arab.
The only half of Obama that is 'black' is his 'better half', Michelle.
Obama might be correctly termed 'African-American'.
After all, one of his parents was an American citizen, and one an African citizen. He certainly has more right to be called African-American than any 'black' person living in the U.S.