I was born in Idaho, but have lived in Tennessee longer than anywhere else. There are a lot more skin head-types and KKK rallies in Idaho than I have ever even heard of here. I know there is some small klan activity in Claiborne and Union counties, and I imagine that some of the other rural counties like Cocke County, but it's generally just really old fools that time has passed by.
Now, Idaho has a problem in some towns. A real problem.