Joe Biden's pick as Barack Obama's running mate hasn't just saved the Obama campaign — it's saved Biden's literary career! Sales of the hair-plugged senator's boilerplate political tome, Promises to Keep, had been disappointing since it was released in July of 2007. But over the weekend Biden's sales got a bump, and he's rocketed into the top 30 on Amazon. Sadly, Evan Bayh's Argentina's Economic Crisis: Hearing Before the Committee on Banking, Housing, and Urban Affairs, U.S. Senate wasn't so lucky, and remains stuck at No. 6,058,222.