Well, it turns out I'm not the only one thinking that direction. David Frum at the National Review--yes, the National frikkin' Review--is suggesting the exact same line of attack.
Here's I fear the worst harm that may be done by this selection. The McCain campaign's slogan is "country first." It's a good slogan, and it aptly describes John McCain, one of the most self-sacrificing, gallant, and honorable men ever to seek the presidency.
But question: If it were your decision, and you were putting your country first, would you put an untested small-town mayor a heartbeat away from the presidency?
The Sarah Palin pick leaves McCain open to attacks on his desperation to win as opposed to being sincere about his desire to do what's best for the country.