Wall Street Probes: Collateralized Debt Obligations

Collateralized debt obligations, once hailed as the ingenious brainchildren of a Wall Street that knew no bounds, are now at the center of a widening government probe into the nation's most prominent banks. And as the focus gradually shifts from Goldman Sachs to all of Wall Street, CDOs have become the rallying cry for those who see the need for regulators to erect walls between banks' divisions