Michelle Obama Michelle Obama

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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Mandel Ngan/AFP/Getty Images

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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Saul Loeb/AFP/Getty Images