There's been much debate in recent weeks about how history will treat George W. Bush. He left office with one of the worst approval ratings of any president. But historians say it will be years before the determination of where Bush stands among the nation's worst presidents.

Phillip Payne is a history professor at St. Bonaventure University. He's written a book titled "Dead Last: The Public Memory of Warren G. Harding's Scandalous Legacy." He joined us on the phone to tell us how Harding's legacy informs our debate about Bush.

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