By Travis Loller and Kristin M. Hall Contributing Writers NASHVILLE, Tenn. (AP) — Clara Ester, an activist who as a 20-year-old college student rushed to Martin Luther King Jr.’s side after he was shot in 1968, has died. Ester, who died on July 9 at age 78, was among a few remaining witnesses to King’s assassination and its immediate aftermath in Memphis. With her death and the passing of the Rev. Jesse Jackson Sr. in February, King aide and fo…