Charlie Rose Show, A discussion about the crisis on Wall Street

A discussion about the crisis on Wall Street with Lawrence Summers, Andrew Ross Sorkin of The New York Times Charles Gasparino of CNBC, Josh Rosner of Graham Fisher & Co. and Nouriel Roubini. Lehman Brothers, the fourth-largest US investment bank, has filed for bankruptcy protection, stock markets and the US dollar have tumbled in reaction to Lehman's collapse.