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White House official says Yellen front runner for Fed chair

WASHINGTON (Reuters) - A White House official said on Wednesday that Federal Reserve Vice Chair Janet Yellen is the front runner to take over the top job at the U.S. central bank when Ben Bernanke steps down, the strongest indication yet of her likely nomination.

The official declined to comment on the timing of any announcement.

(Reporting By Mark Felsenthal; editing by Christopher Wilson)