Do you really think she has any chance after quitting her job as governor? I mean, her opponents won't even have to dig for juicy material for their commercials.
There's always a chance. As has been pointed out by others, she does have a following. Also, her proponents will argue that she did not "quit," but resigned to give her better access to the lower 48 (which was difficult because of the ethics violations democrats filed every time she left the state - why'd they do that? because they were scared?).