She's a blithering idiot. She just contradicted every conservative in the country and overruled her own views on abortion. Watch this video, the full video, from CBS, showing Biden answering the Supreme Court question, then showing Palin answering it. Biden is brilliant. Agree with him or not, the man has a brilliant mind. Then watch Palin's answer to the same question.
UPDATE: Josh Marshall weighs in as well:
[T]he right to privacy, as Couric says in the interview, is one of the cornerstones of Roe. And in the public debate yes or no on the right to privacy is something pretty close to a proxy for your position on abortion rights.
The bottom line is that among conservatives opposition to a constitutional 'right to privacy' is a straight-up litmus test issue. Palin not only didn't have the right answer on the right to privacy. It was pretty clear she'd never even heard of it before.