She wasn’t that popular a governor, people who weren’t GOP nerds had never heard of her. She might have been able to make a stab at POTUS in 12 as one of the crowd, now she’s a front runner and if she’s smart can stay that way. McCain advanced her clock at least 3 years, that earns him a little bit of “thank you” campaigning. Anyway, campaigning, even for a slug like McCain, keeps her in the spot light and a front runner in 12.
So she's putting her own interests ahead of Arizonians and long-term conservatives' interests of seeing a younger, more conservative represent the Senate.
When amnesty for illegals comes up and McCain is among one of the chief sponsors, it'll be interesting to see what Sarah posts in her Facebook account.