Education Secretary Arne Duncan said in a letter to his staff that he will step down to spend more time with his family, who live in Chicago. Chip Somodevilla/Getty Images hide caption

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A hallway scene at Richmond High School in Richmond, Ind.,  on Nov. 29, 2010. There, struggling students are getting tutoring in a bid to have everyone graduate on time. Darron Cummings/AP hide caption

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