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Malia and Sasha Obama arrive prior to their father US President Barack Obama at the Edmund Pettus Bridge March 7, 2015 in Selma, Alabama.US President Barack Obama and the first family joined others to commemorate the 50th anniversary of Bloody Sunday where voting rights marchers attempting to walk to the Alabama capitol clashed with police at the base of the Edmund Pettus Bridge in Dallas County. AFP PHOTO/BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

Malia and Sasha Obama arrive prior to their father US President Barack Obama at the Edmund Pettus Bridge March 7, 2015 in Selma, Alabama.US President Barack Obama and the first family joined others to commemorate the 50th anniversary of Bloody Sunday where voting rights marchers attempting to walk to the Alabama capitol clashed with police at the base of the Edmund Pettus Bridge in Dallas County.    AFP PHOTO/BRENDAN SMIALOWSKI        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)