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First lady Michelle Obama walks with her daughter, Malia Obama as they walk across the South Lawn upon their return to the White House September 6, 2009 in Washington, DC. The first family was vacationing at Camp David. (Photo by Ron Sachs-Pool via Getty Images)

The Obama girls grow up

As their dad Barack Obama accepts the nomination to run for his second term as president, Yahoo looks back at how much Sasha and Malia have grown up over the last four years.