NEW : Car bomb in Afghanistan kills 4,800 after Obama visit . Facing an election at home , the president says `` this time of war '' will end . Romney lauds Mitt Romney said , `` I am pleased that President Obama has returned to Afghanistan . Obama visit , says Kabul `` success '' is vital . Obama and American President James Inhofe sign an agreement on future cooperation .
NEW : Car bomb in Afghanistan kills 4,800 after Obama visit . Facing an election at home , the president says `` this time of war '' will end . Romney lauds Obama visit , says Kabul `` success '' is vital . Obama and American President James Inhofe sign an agreement on future cooperation .