WASHINGTON -- If you're a Democrat who needs help getting the votes of rural white folks, the go-to guy is David "Mudcat" Saunders, a central-casting political consultant recently made famous by a parade of magazine writers led by The Weekly Standard's Matt Labash. But sometimes you can learn more about a people and their place through literature than by hiring consultants. So I called Ron Rash, poet, author and purebred Appalachian whose newest novel, "Serena," should be at the top of Barack Obama's reading list. Sarah Palin might enjoy it as well. Described by one blurber as "an Appalachian retelling...