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Another U.S. Downgrade?

Tuesday, 1 May 2012 | 3:00 PM ET

Despite May Day's12% S&P 500 rally on better-than-expected ISM data, PIMCO's Bill Gross cautioned the U.S. could get another downgrade. CNBC's Michelle Caruso-Cabrera, Bill Griffeth, Sue Herera and Bob Pisani weigh in.