Palin, like Bush, doesn't have to just fight the Democrat contender. She has the (D)'s, the 24-hour press and, in the case of Palin, most of the blue-bloods of the Republican party.
Is she a truly viable candidate? Not likely. Too many negatives from those who want professionals, not base-line. The press has visciously attacked her since the beginning.
We can get Romney. The ken-doll tanned professional who has already proven his willingness to lay-over for politics. (see the Mass healthcare debacle)
We can get Newt. The silver-haired professional who has proven his willingness to lay down his life for deal-making instead of standing his ground.
Palin is the only true conservative with national name recognition. Pence? Jindal? Steele (rofl)? Daniels?
Someone will have to come out of the shadows. Otherwise, we're looking at another progressive with an (R) attached to his/her name because people won;t stand up for true beliefs. They want hope & change - some more.