SELMASunday, Mar 7, 1965, was a tense day in Selma AL. That afternoon, about 600 people -- mostly African-Americans, many still in their church clothes -- set off from Brown Chapel AME church. Their goal was to walk to the state capital of Montgomery, 54 miles away. Part of an ongoing campaign spearheaded by civil rights leader Martin Luther King III, they were marching to demand the ability to vote, denied to them in much of the South. Here, Brown discusses how the Selma-to-Montgomery marches 50 years ago helped end discrimination against black voters.