Recent polling indicates that the attack that works against Barack Obama is to question his experience. The McCain campaign has been -- to good advantage -- using recycled Clinton ads including ones that echo the "3 a.m." ad.
They can't use those any more. Attacking Obama's experience would be dangerous given that Gov. Palin has far less experience than Obama. Given John McCain's age and medical history, it would be fair game to point out Palin's lack of experience and question whether she's ready to be presidency. Especially since -- statistically -- she's far more likely to ascend to the presidency during the next 4 years than Democrat Joe Biden would be.