"Why do conservatives worship this guy so much?" for the same reasons liberals worship John Stewart.
He's funny, and he insults their "enemies", thus reducing any requirement they might have of thinking about politics, rather than pulling themselves together for communal circle jerking, and scapegoat pushing.
Rush Limbaugh is the kind of loony that just makes conservatives look bad. Serious conservatives want nothing to do with him and wish he would just shut his hypocritical mouth. If you want a real conservative look to Ron Paul.