As the candidates brush up on global politics and pundits sharpen their knives, GalleyCat took a look at the books behind tomorrow's Vice Presidential debate.

While she hasn't written a book yet, Sarah Palin's story has sold the most books so far. Kaylene Johnson's tome, Sarah: How a Hockey Mom Turned the Political Establishment Upside Down, has rocketed up to third place on Amazon's Political Bestseller list--a huge hit for Epicenter Press.

Even Palin imitators are getting in on the action. Today, the New York Post reported that Tina Fey received a six million dollar offer for her own book.

Senator Joseph Biden has his own book, currently ranked 62 among Political Bestsellers on Amazon. It's called Promises to Keep: On Life and Politics, published by Random House.

Finally, debate moderator Gwen Ifill has her own book coming out in January from Random House, The Breakthrough: Politics and Race in the Age of Obama. That book generated some outraged headlines yesterday, as Politico reported.