President Barack Obama greets guests as he arrives at Ellington Field Friday, March 9, 2012 in Houston,Texas. (AP Photo/Bob Levey)

Associated Press
President Barack Obama greets guests as he arrives at Ellington Field Friday, March 9, 2012 in Houston,Texas. (AP Photo/Bob Levey)
President Barack Obama greets guests as he arrives at Ellington Field Friday, March 9, 2012 in Houston,Texas. (AP Photo/Bob Levey)
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