It opened with a video from an organizer speaking of that goal , and continued in Rawlings remarks , which keyed off Kennedy 's call for the United States to embrace and conquer a `` New Frontier '' of challenges . NEW : `` He and our city will forever be linked , '' Dallas mayor says . The man who was shot by police in downtown Dallas, a black man, is now the first person to sue the city, saying he suffered from post-traumatic stress disorder after being shot. Moment of silence , bells , mark moment 50 years ago Kennedy was shot . Wreath laid in Boston ; House prayer invokes Kennedy 's memory .
NEW : `` He and our city will forever be linked , '' Dallas mayor says . The man who was shot by police in downtown Dallas, a black man, is now the first person to sue the city, saying he suffered from post-traumatic stress disorder after being shot. Moment of silence , bells , mark moment 50 years ago Kennedy was shot . Wreath laid in Boston ; House prayer invokes Kennedy 's memory .