The First Family joins Rep. John Lewis, former President George W. Bush and former First Lady Laura Bush during a walk across Edmund Pettus Bridge

President Barack Obama, First Lady Michelle Obama, daughters Sasha and Malia, Marian Robinson, join Rep. John Lewis, and former President George W. Bush and former First Lady Laura Bush during a walk across Edmund Pettus Bridge to commemorate the 50th Anniversary of the "Bloody Sunday" march from Selma to Montgomery, in Selma, Alabama, Saturday, March 7, 2015.