I think most people vote as individuals.
I think most people have reasonably clear political principles and political goals.
If Thomas Sowell, a Black man and one of America's leading Conservative thinkers, ran for president, I don't think he get 15% of the Black vote.
Actually I agree with you, somewhat. I think Thomas Sowell would be cast as an Uncle Tom, or more generally as a traitor to the tribe. I think that loyalty to the tribe carries a much heavier weight in the decision process of people than we think. Maybe it’s instinctual, “safety in numbers”, so to speak.