ANALYSIS: Obama had joked last week that he would say during the debate “we got bin Laden.” His task was to find a way to tell that story without simply thumping his chest. He found a way, telling the story of a person who thanked him for killing the man who killed her father at the twin towers, bringing closure. “We did not forget her father,” the president said. A deft way to retell a story everyone already thought they knew. by Michael Kranish, Globe Staff 10/23/2012 2:07:14 AM