President Barack Obama greets students before the Joplin High School commencement, a 

President Barack Obama greets students before the Joplin High School commencement, a day before the anniversary of the twister that killed 161 people, Monday, May 21, 2012, in Joplin, Mo. Obama jetted to Joplin to deliver the commencement address immediately after wrapping up the national security-focused NATO conference in Chicago, the second international summit the president hosted over the past four days. (AP Photo/The Kansas City Star, Rich Sugg, Pool)
Associated Press
President Barack Obama greets students before the Joplin High School commencement, a day before the anniversary of the twister that killed 161 people, Monday, May 21, 2012, in Joplin, Mo. Obama jetted to Joplin to deliver the commencement address immediately after wrapping up the national security-focused NATO conference in Chicago, the second international summit the president hosted over the past four days. (AP Photo/The Kansas City Star, Rich Sugg, Pool)
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