I think you would be surprised, and I think the number of white american racists is higher. I don't run into much racism, but I hang out with folks from my church and a small circle at work. But outside my conservative group of friends, I work with a lot of liberals...(I work in a university town with a lot of 'liberal cred' - Iowa City, IA). That said, liberals can be extremely racist, and so they project their racism onto the world in general.
Was meeting with some folks from church this weekend - 2 white guys, a black guy and his daughter, and another guy from a pacific island. We talked a little about race and some other stuff, and we have great discussions. Which would have made a liberal uncomfortable...