I am French, Irish, German and Black but I wouldn't have known without genetic analysis.
Among the black community, they identify those blacks who were born and raised in Africa,
who have the deepest, dark skin pigmentation as :" Blue-blacks" (with a slight blueish hue to the skin).
The "Blue-blacks" generally and historically intermarried within their own tribal group in Africa due to geographic isolation.
Then you have an identified "mixed-mulatto" black group
Then you have an identified "light skin" black group, which suggests common inter-racial and mixed marriages .
As I recall, it was Mrs. Robinson, Michelle's mother who was opposed to her daughter's marriage to Barack Obama because he wasn't "black enough".
That sounds awfully racist to me, and not dependent on his personality or character.