George Will sees McCain as the Queen of Hearts:

It is arguable that, because of his inexperience, Obama is not ready for the presidency. It is arguable that McCain, because of his boiling moralism and bottomless reservoir of certitudes, is not suited to the presidency. Unreadiness can be corrected, although perhaps at great cost, by experience. Can a dismaying temperament be fixed?

I would be less circumspect, as I obviously believe the answer to “no chance.”