People ain't never gonna be colorblind: I posed the question a few days ago, why Obama has done so well in places like Idaho and Alaska, and the best answer I found was Sailer's view that a white person in states with few blacks gets to feel like he has a hip black friend by voting for Barack. Growing up in that kind of a state, I would describe the person as racially green; someone who, for lack of experience, is filled with the kind of racial idealism that people across the North had in the 60s. The support Obama is getting from young voters can be explained in the same way.
But these primaries are just more data points supporting the idea the people just can't be colorblind. Blacks across the country voted for Obama because he's black; race-fatigued southern and northeastern whites cast ballots against him because he's black; Hispanics everywhere voted against him because of his color; and idealist whites from Minnesota to Alaska thought of all the good it will do to vote for a black man.
The question is, is there anyone out there that voted for him, and didn't see race? I don't think so.
Whether genes has much to do with it or not, race has always been a potent social reality, and it will continue to be one.