According to comments former Gov. Palin made on conservative talk radio recently, she thinks it's fair for people to ask President Obama to provide proof that he was indeed born in the United States. While discussing the issue of what is "fair game" for press inquiry, she mentioned that some people have repeatedly asked her to provide proof that she gave birth to her youngest child. "Which we have done," she said (Andrew Sullivan must've not been invited to that press conference). She also said that ANWR is "frozen year-round," and thanked God for the leaked correspondence of climate scientists. Politico has an excerpt from the interview's transcript, as well as an embedded recording of the complete interview,
here, (the birth certificate stuff happens around 9 minutes in).