McCain's advisors are making a big mistake going after Palin privately with attacks like this:

“She is a diva. She takes no advice from anyone,” said this McCain adviser, “she does not have any relationships of trust with any of us, her family or anyone else. Also she is playing for her own future and sees herself as the next leader of the party. Remember: divas trust only unto themselves as they see themselves as the beginning and end of all wisdom.” 

As Kevin Drum notes, Sarah Barracuda will get her revenge, sooner rather than later:

And you know the part I'm really looking forward to? Sarah Palin's role in all this. I expect her to rip McCain absolutely to shreds. On background, of course, but it will be no less vicious for that. Her future, such as it is, lies with the wingnut rump of the party, and she knows what her audience wants: John McCain's blood. And lots of it. They never liked him in the first place, and I expect them to be howling for his head on a platter starting at about 8:01 pm EST on November 4th.