Warren buffet markets 8 7 2011

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Billionaire says he'd give the U.S. a "quadruple A."

Warren Buffett says he'll match any GOP donation to cut debt

Warren Buffett says he'll match any GOP donation to cut debt.

President Barack Obama presents Berkshire Hathaway chairman Warren Buffett with the 2010 Medal of Freedom at the White House Feb. 15, 2011. The medal is the highest honor awarded to U.S. civilians.

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