Don't mind you disagreeing because I have an answer for you. :>)They could for the GOP, but in my opinion, they wouldn't. Overwhelmingly they vote for Obama for two reasons: the first being that he's black and the second for the potential freebies, the freebies West would not promise.
I think you've got that reversed. If Obama were on the GOP ticket, and championed GOP policies, he would get no more than 10% of the black vote. Clarence Thomas received black support because they figured a guy that dark couldn't possibly be all that conservative. Since then, they've regretted their decision and vilified him as a retard and a race traitor.