About what percentage of Obama haters do you estimate are actually racists?

While he is (biracial) he is thought of as a black man. There's plenty of people who hate his policies, his actions and his inaction. I think it's fair to say that some of that hatred or dislike is compounded by the fact that he is black. He is the first black president and this is uncharted territory in the United States so I think it's a good assumption that a significant percentage of Obama haters either knowingly or subconsciously include his race as a reason for not liking him.