(L-R) U.S. President Barack Obama and first lady Michelle Obama walk up the ramp with Michelle Obama's mother Marian Robinson and their daughters Sasha and Malia as they board Air Force One for departure from Joint Base Andrews, Maryland for a day trip to Selma, Alabama, March 7, 2015. Obama will call on Americans to carry forward the spirit of the Civil Rights Movement on Saturday during a visit to Selma, Alabama, to commemorate the 50th anniversary of a march that sparked the 1965 Voting Rights Act. REUTERS/Mike Theiler (UNITED STATES - Tags: POLITICS ANNIVERSARY)