Justice Department sues S&P over mortgage bond ratings

The federal government is embarking on one of its most ambitious efforts to assign blame for the financial crisis, going after Wall Street's biggest credit rating firm for its role in pumping up the housing bubble. The Justice Department filed a lawsuit late Monday in Los Angeles federal court against Standard & Poor's Corp. The suit accuses the company's analysts of issuing glowing reviews on troubled mortgage securities whose subsequent failure helped cause the worst financial crisis since the Great Depression. The action marks the first federal crackdown against a major credit rater, and it signals an untested legal tack after limited success in holding the nation's banks accountable...