Newsflash: John McCain is running for President. Not Sarah Palin. The more Democrats give her their attention, the more their resources will be diverted from actually winning the election.
Sarah Palin's job is as decoy, and she is doing it well. She is attracting the liberal rage at her seeming lack of qualifications or knowledge.
As long as the rage is focused on her, it won't be spent debunking John McCain's claims or qualifications. Palin knows this. John McCain knows this. I'll bet that everyone jumping up and down for the pistol-packing, moose-killing mama knows it, too.
So once again, the United States is going to be "Reaganed." The Democrats are going to divert their attention to the wrong person, seriously underestimating him/her, while looking like snotty elitist bastards. Put another way, if you insult Palin for being stupid, you also insult the people who like her. And that is no way to convince anybody to change their vote.
Sarah Palin will never be discredited in the eyes of her followers. It is pointless to try. OK, it might make you feel better. Even superior. But it won't get you into the White House.