Sure, there are racists in the Republican Party. (There are some in the Democratic Party, too.) And if you define racism as disagreeing with the Congressional Black Caucus or Barack Obama, the GOP is racist to the bone.
It may be entirely possible he knows no better, but it's misleading to omit the fact that Jim Crow, lynching, black disenfranchisement, the KKK and even the war to protect slavery were all Democrat issue!
No discussion of the topic should leave out the fact that the Democrat party is Headquarter Central to racism.
*rme*