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The wife of President Barack Obama landed the No. 1 spot, leaving Gaga in seventh place and Beyonce in ninth position.
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Talk show titan Oprah Winfrey is named the third-most-powerful female, behind the CEO of Kraft Foods, Irene Rosenfeld, who is in second place.
Other entries in the top 10 include U.S. Secretary of State Hillary Clinton and Ellen DeGeneres.
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