Karl Rove is not a racist like Bull Connors, but he favors using race as a way of manipulating the electorate. Having Cain in the race allows the GOP to disclaim the fact that there are racists in their party.
Cain got 36 % of the vote in the FL primary. At best, this indicates that 36% of the voters in that straw poll are not racists.
You are, of course, a racist, Kramer. Everyone here has seen ample evidence of that. But you are also not the sharpest tack in the box, which explains how you feel you can deny your racism.