Janet Yellen during her confirmation hearing earlier this month. She's expected to win Senate approval to take over as head of the Federal Reserve. Brendan Smialowski /AFP/Getty Images hide caption

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Janet Yellen, President Obama's nominee to become the next chairman of the Federal Reserve Board, is sworn in Thursday on Capitol Hill for her confirmation hearing. Jacquelyn Martin/AP hide caption

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Federal Reserve Board Vice Chairman Janet Yellen is considered a top candidate to replace Ben Bernanke now that Lawrence Summers has withdrawn his name for contention for the Fed's top job. Robert Galbraith/Reuters/Landov hide caption

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Citing what he calls an "acrimonious" confirmation process, Lawrence Summers called President Obama to tell him of his decision not to seek the job of Federal Reserve Chairman Sunday. AFP/AFP/Getty Images hide caption

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