I just came across an article about regional dialects on Courant.com entitled " Where Y'All From?" This article talks about various regional dialects and mentions Sarah Palin's Alaskan dialect specifically. In the article Steven Weinberger, a linguistics professor from George Mason University, notes that Palin's speech has a North Dakotan flavor. He also suggests that she may exaggerate her Midwestern roots to be associated with Marge, the character from the movie "Fargo" who heroically solves everything.
Did I mention that "Fargo" is one of my favorite movies?