Sarah Palin, 55 percent unfavorable poll ratings notwithstanding, is a political phenomenon the likes of which American public life rarely has seen. There's something distinctive, something deeply personal, about the way her legions of strong supporters rush not just to defend her but to counter-attack any and all of her critics. Palin has a way of establishing a sense of connectedness with her backers -- such a strong, attitudinal sense that she is not just like them but one of them -- that she has created what amounts to a one-woman, conservative "identity politics" writ very, very large. Yet if...