No. He's a paid personality who acts his part so he can get people riled up, talking about his show and, thus, watching his show. He gets ratings and does a very good job of what they tell him to do. I don't think he actually believes half of what comes out of his mouth.
I honestly can't decide whether he just says outrageous bull**** just for the sake of drawing attention to himself, or if he actually believes in what he says. If he actually believes in what he says, then yes, he is almost certainly suffering from some sort of retardation.
He is by far the worst person to listen to, and I immediately flip the channel as soon as I hear his obnoxious voice.