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However, as Fed Chairman Ben Bernanke maintains a cautious outlook for the U.S., the central bank head may keep the door open to conduct another round of quantitative easing, and increased expectations for QE3 is likely to weigh on the USD as interest rate expectations falter.

http://www.dailyfx.com/forex/fundamental/daily_briefing/daily_pieces/trading_news_reports/2011/12/12/EURUSD_Trading_the_FOMC_Interest_Rate_Decision.html