Right after John McCain picked Sarah Palin to be his VP, I predicted she'd last two weeks and then be laughed off the ticket. Of course she's still front and center in the political stage, so, so much for my prognostications.
The McCain campaign kept Palin away from reporters, so it's taken longer to get to know her than would have been otherwise. This is the chief reason she's made it this far. Smart stage management.
Palin's a rock star to the religious conservative wing of the Republican party, and McCain desperately needs those votes, so he's got to keep her around. Also, admitting that she was a mistake would undercut his claim to having good judgment because he's got so much experience.
But, I'm guessing right now he wishes he could trade her in for a different model. Palin's negative rating has risen steadily. Her clothing debacle is an embarrassment for a person who says she's just a Jane Six pack hockey mom; $150,000 worth of expensive clothes on a self-professed Jane Six pack is a juxtaposition that undercuts McCain's latest message. Palin is widely seen as not qualified, at least not yet, to be President. Many of her statements have been proven false ("I opposed that bridge to nowhere").
So, right now, Palin is politically dead, yet she still walks the Earth. She's become a political zombie, lurching about, scaring voters. And McCain's stuck with her.