Obama is half Kenyan and half Irish. So he is not black. He is mixed. He self-identifies with the black community. All this is fine and dandy, but in Africa, you are not black unless you are black, if you are mixed, you are referred to as mixed and there is nothing wrong with that.
I do agree that people tend to cheer for or support people who are similar to them. It is natural.
Black people for sure refer to black cultural things like art, music, and sports and they refer mostly to black people — totally understandable. But to call out a white person for cheering for a white person and calling it bias in a negative way is jealousy.
Jealousy comes from weakness or an inferiority complex.
If you are going to call out bias negatively, then start recognizing the millions of white people who cheer for and support mixed and black people.