A new book examines our nation's racist past by speaking directly to Black Americans whose deaths fueled calls for change. In "Long Time Coming: Reckoning with Race in America," author and Vanderbilt University professor Michael Eric Dyson writes letters to Emmett Till, Eric Garner, Breonna Taylor, Sandra Bland & other "black martyrs." He discusses the fight for racial and social justice with CBS News' chief justice and homeland security correspondent Jeff Pegues.