U.S. President Barack Obama and his family arrive aboard Air Force One at Maxwell Air Force Base in Montgomery, 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/Jonathan Ernst (UNITED STATES - Tags: POLITICS ANNIVERSARY)