Much has been done in six months to deal with the ongoing war in Afghanistan. We have restated that our aim is to eliminate the threat of Al Qaeda; built a new leadership team, including Special Representative Richard Holbrooke; reinforced our troop strength and adjusted our tactics; and have begun augmenting our force with synchronized diplomatic, political and economic efforts. But can we explain how all of this adds up to an effective strategy that will sustain American engagement in one of the world's least accessible regions? The American people are growing increasingly wary. In a new CNN/Opinion research poll,...