That was kind of my point. Rush hasn't really made any racist comments, but the left can't let that slur rest, since it is their fall back position when they have no real counter argument.
There is a book that quotes have been taken from that do seem racist though. It's called Dream's of My Father.
From Dreams of My Father: 'I ceased to advertise my mother's race at the age of 12 or 13, when I began to suspect that by doing so I was ingratiating myself to whites.'
From Dreams of My Father : 'I found a solace in nursing a pervasive sense of grievance and animosity against my mother's race.'
From Dreams of My Father: 'There was something about her that made me wary, a little too sure of herself, maybe and white.
From Dreams of My Father: 'It remained necessary to prove which side you were on, to show your loyalty to the black masses, to strike out and name names..'