KICKING THE INFIGHTING UP A NOTCH....

McCain sources say Palin has gone off message several times, and they privately wonder if the incidents were deliberate. They cited that she labeled robocalls -- recorded messages often used to attack a candidate's opponent -- "irritating" even as the campaign defended their use. Also, they pointed to her telling reporters she disagreed with the campaign's decision to pull out of Michigan.

A second McCain source tells CNN she appears to be looking out for herself more than the McCain campaign.

"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."