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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First Lady Michelle Obama at the White House on May 9. John Stillwell / pool/Getty Images hide caption

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Stuffed animals and flowers at a makeshift memorial near the entrance to the grounds of Sandy Hook Elementary School. Brendan Smialowski /AFP/Getty Images hide caption

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Mitt Romney speaks Thursday at American Legion Post 176 in Springfield, Va. Alex Wong/Getty Images hide caption

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Ari Shapiro interviews Bobbie Lussier on Thursday.

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The scene Tuesday night at the Democratic National Convention in Charlotte, N.C. Mladen Antonov /AFP/Getty Images hide caption

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From 'Morning Edition': Mara Liasson reports on Night One

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