AP Photo/Jacquelyn Martin President Barack Obama, fourth from left, walks holding hands with Amelia Boynton Robinson, who was beaten during "Bloody Sunday," as they and the first family and others including Representative John Lewis, left of Obama, walk across the Edmund Pettus Bridge in Selma, Alabama, for the 50th anniversary of the landmark event of the civil rights movement, Saturday, March 7, 2015. This book review appears in the Fall 2015 issue of The American Prospect magazine. Subscribe here . Give Us the Ballot: The Modern Struggle for Voting Rights in America By Ari Berman 384 pp. Farrar, Straus and Giroux $28.00 O n March 7, 1965, John Lewis helped lead protesters on the historic march over the Edmund Pettus Bridge in Selma, Alabama. Lewis walked side by side with Hosea Williams until the marchers were set upon by Alabama state troopers. The infamous Bloody Sunday assault left Lewis with a fractured skull, one of dozens of civil-rights protesters injured for demanding the...