Oh yes, everyone has advice and I can't help but weigh in:
Practice verbal judo with Sarah. For every answer, try to follow up with a question that is a logical extension of her assertions.
For example (from McCain in the 1st debate), he intimated that to pull out of Iraq would've been to let those soldiers die in vain. Barack was a bit too subtle in saying no soldier who follows his commander dies in vain. Instead, I would've asked McCain back if he really thought all the names on the wall of the Vietnam memorial died in vain. McCain clearly thought that war was lost and not worth repeating in Iraq.
She doesn't even need to go off her talking points (though she will!) because most of those points, taken to their logical extreme, fly in the face of common sense. Besides, if you ask the question sincerely, its the best way not to look condescending.
Also, she screams for comparisons to Bush and Cheney. I like the image she conjured up already: a pit bull. (Bush's) stubborn determination combined with (Cheney's) go-for-the-jugular attack instinct. Like we need another pit-bull in the White House.
my two bits.
Lastly, I know she's so proud of not blinking and all, but isn't she really saying she didn't think instead? Yet another obvious reference to Bush.
In fact, aren't the Bush years strewn with examples of putting unqualified people in positions way beyond their abilities? Monica Goodling, that 25 year-old in charge of some Iraq ministry, Alberto Gonzales... Joe could tell the story about any one of them and let people draw the parallel with Sarah quite effectively.