Rush is there not to prove a point through discourse but to get people pissed off enough to listen.
I is probably true that more liberals listen to Rush then conservatives.
Ever see the movie Howard Stern's Private Parts? In it the radio guy asks about the ratings - thinking that Howard pissing people off turns off viewers - it turned out that those that hated Stern listened longer - why? because they wanted to hear what he had to say next.
It is all a gimmick and I am suprised we are all getting hot and bothered over a radio show. Like arguing which circus clown is funnier.