What options does Obama have to close Guantanamo?

By Susan Cornwell and Jane Sutton (Reuters) – With his renewed vow to close the detention camp for foreign terrorism suspects at Guantanamo Bay, President Barack Obama has effectively assigned himself a list of possible ways to take the prison's population down from 166 to zero. Some would be more easily achieved than others. In pledging to look again at an unfulfilled promise dating back to his first election campaign and early days in office in 2009, Obama made plain on Tuesday that it was untenable to keep the 11-year-old camp open. A hunger strike at the camp at the U.S. …