Former first lady Laura Bush ( from L to R), former president George W. Bush, first lady Michelle Obama, U.S. President Barack Obama and U.S. Representative John Lewis (D-GA) participate in a commemoration at the Edmund Pettus Bridge in Selma, Alabama, March 7, 2015. Obama called 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 SOCIETY)