uncertain terms that we've made our union a little more perfect. >> reporter: all that was temped by a hate crime that claimed nine lives in its church including its leader. >> preacher by 13 pastor by 18 public servant by 23. what a life clementa pinckney lived. ♪ amazing grace ♪ >> in a rare moment, the president broke into song a call for unity in the battles not yet won. ♪ that saved a wretch like me ♪ >> reporter: just a remarkable moment. the president took on the issues of guns and race joining the call to bring down the confederate flag in south carolina, all capping a week