Why do Republicans claim Obama is inexperienced?

Received his BA from Columbia University, one of the world's ten best; attended the Harvard law school, the best in the country, where he was the editor of the law review, the highest honor for a student; taught constitutional law at the storied University of Chicago; state senator; US senator; president of the United States. How the hell is that inexperienced? And if it is, what does that say about Palin, a beauty contestant who became governor of a state with the population of an oversized town?