The eldest son of Rev. Jesse Jackson Sr. took a swipe at the former Democratic presidents who paid tribute to his father during a memorial service on Friday. "I listened for several hours to three United States presidents who do not know Jesse Jackson," Jesse Jackson Jr., the late reverend's eldest son and a former congressman seeking to win back his seat in Congress in this fall's midterm elections, said on Saturday at Jackson's final memorial service at the Rainbow PUSH Coalition's headquarters on the South Side of Chicago...