Ben Bernanke

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** FILE ** Federal Reserve Chairman Ben Bernanke's testimony before Congress is shown on a television screen on the trading floor of the New York Stock Exchange, Tuesday, July 17, 2012. (AP Photo/Richard Drew)

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Federal Reserve Chairman Ben S. Bernanke appears before the House Financial Services Committee on Capitol Hill in Washington on Wednesday, July 18, 2012, to deliver his twice-yearly report to Congress on the state of the economy. (AP Photo/J. Scott Applewhite)

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Federal Reserve Chairman Ben S. Bernanke presents his semiannual Monetary Policy Report to Congress on Tuesday, July 17, 2012, at the Dirksen Senate Office Building in Washington. (Barbara L. Salisbury/The Washington Times)

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Federal Reserve Chairman Ben S. Bernanke presents his semiannual Monetary Policy Report to Congress on Tuesday, July 17, 2012, at the Dirksen Senate Office Building in Washington. (Barbara L. Salisbury/The Washington Times)

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Federal Reserve Chairman Ben S. Bernanke pauses as he arrives to give his semiannual report to the Senate Banking Committee on Tuesday, July 17, 2012, on Capitol Hill in Washington. (AP Photo/Carolyn Kaster)

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**FILE** Federal Reserve Board Chairman Ben S. Bernanke speaks June 20, 2012, during a news conference in Washington. (Associated Press)

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** FILE ** Federal Reserve Chairman Ben S. Bernanke speaks during a news conference on Wednesday, June 20, 2012, in Washington. (AP Photo/Haraz N. Ghanbari)

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Ben S. Bernanke, chairman of the Fed, appears on a television on the floor of the New York Stock Exchange. Mr. Bernanke said the U.S. economy is being held back by lingering weakness in the housing market. (Associated Press)