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President Barack Obama embraces a school official as he views the devastation of the Plaza Towers Elementary School, Sunday, May 26, 2013, in Moore, Okla., caused by a tornado and severe weather last week. (AP Photo/Carolyn Kaster)

President Barack Obama embraces a school official as he views the devastation of the Plaza Towers Elementary School, Sunday, May 26, 2013, in Moore, Okla., caused by a tornado and severe weather last week. (AP Photo/Carolyn Kaster)