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Christine Lagarde - Thrust into the breach during one of the worst economic crises in decades, Christine Lagarde, the new head of the International Monetary Fund, has become one of the world's most powerful women. The Pledge - Steve Kroft takes a look at Grover Norquist, the man many blame for holding up the deficit-reduction process because of the anti-tax pledges he has obtained from nearly all the Republican politicians in Washington. Taylor Swift - She writes and sings all her own songs, sells millions of records and she's just 21 years old. Lesley Stahl profiles music sensation Taylor Swift.