With four months left to meet its self-imposed deadline for closing the U.S. military prison at Guantanamo Bay, Cuba, the Obama administration is working to recover from missteps that have put officials behind schedule and left them struggling to win the cooperation of Congress. Even before the inauguration, President Obama's top advisers settled on a course of action they were counseled against: announcing that they would close the facility within one year. Today, officials are acknowledging that they will be hard-pressed to meet that goal. The White House has faltered in part because of the legal, political and diplomatic complexities...