But the Obama campaign calls her a candidate with “the thinnest foreign policy experience in history” who is “currently under investigation in her own state.” And one of the Senate’s top Democrats, Charles Schumer, said that although she is “a fine person, her lack of experience makes the thought of her assuming the presidency troubling.”

What do we know about Sarah Palin, the 44-year-old first-ever female governor of Alaska, wife and mother of five, and now GOP vice presidential nominee?

On Friday, a new part of her identity dominated the political scene: game-changer.

She enters an already historic election, knowing well two of the biggest things McCain needs her to do: shore up votes among social conservatives and win over disaffected Hillary Clinton-supporting Democrats, many of them women.