From left, President Barack Obama, Sasha Obama, first lady Michelle Obama,  

From left, President Barack Obama, Sasha Obama, first lady Michelle Obama,  Malia Obama and Michelle's mother Marian Robinson arrive at Chicago O'Hare International Airport on Air Force One, Friday, June 15, 2012, in Chicago (AP Photo/Carolyn Kaster)
Associated Press
From left, President Barack Obama, Sasha Obama, first lady Michelle Obama, Malia Obama and Michelle's mother Marian Robinson arrive at Chicago O'Hare International Airport on Air Force One, Friday, June 15, 2012, in Chicago (AP Photo/Carolyn Kaster)
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