First Lady Michelle Obama wears her signature cardigan while dancing with performers from the television show So You Can Dance during the annual White House Easter Egg Roll on April 6, 2015. Mark Wilson/Getty Images hide caption

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Mrs. Obama Saves The Cardigan: 'The Obama Effect' In Fashion

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President Obama and first lady Michelle Obama, shown here in September, will deliver keynote addresses at the SXSW Interactive and Music festivals, respectively. Mandel Ngan/AFP/Getty Images hide caption

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Michelle Obama eats lunch with school children at Parklawn Elementary School in Alexandria, Va., in 2012. The first lady unveiled new guidelines Tuesday aimed at cracking down on the marketing of junk food to kids during the school day. Saul Loeb/AFP/Getty Images hide caption

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