Why does Roseanne Barr call our Sarah: "A geopolitically-challenged national pom-pom girl"?

Looking a Roseanne Barr it is pretty obvious she was not on the cheerleading squad. However when Sarah Palin was asked a question by a third grader and she got it wrong. She apparently still does not know what the vice president does ... She says he or she runs the Senate. Nobody would ever accuse George Bush of being a bright man, but when he was elected, at least he knew which building to show up to. Still given that the only endorsement she got from any Conservative group was from Al Quaida and they want to turn the clock back to the 7th Century which is a bit radical as there are some who only want to turn the clock back to the 1950's.