How black is Obama?

I have been watching the Democratic National Convention. It's very interesting although I am not an American. I kind of hope to capture some historic speech life as it is being delivered. But I found none comparable to Dr Martin Luther King Jr's "I have a dream" speech.
In one section, Senator Barack Obama's life story was presented. It strike me that he is so white after all. Here is what I mean. He was raised by his white mother with the support of his white grandparents and no doubt white extended relatives. It's not likely that he experienced the feeling of self doubt, low self esteem, despair, helplessness and anger toward prejudice and injustices that many African Americans who grow up in the inner-city experience. Yes, his skin color is black, but inside, he is white with a mindset, determination, positive attitude and ambition that are typical of the a white American middle class from the heartland. Obama himself practically said (may be not exactly in the following words) that his Kenyan father was just a sperm donor to him.
This does not mean that he had an easy childhood. I am sure it's not easy to be without a father and to be of different color skin from the rest of your family. I am sure he had to field a lot of questions regarding her parentage. May be that's what made him who he is: resilient, clever with his answers, good natured and all the rest.
It is not my intention to undermine the value of his candidacy in the American history. However, the wow factor would have been greater had he been a descendants of an African slave. America can't truly claim victory over its past yet. The debt to the slave descendants is still a specter from its past. It is not fully paid even if Obama is elected as the the next president.
This is my impression. Correct me if I am wrong.