Outgoing Defense Secretary Donald H. Rumsfeld paid a surprise visit to Iraq on Sunday and said U.S. forces should not quit the war until the enemy is defeated. Just days after a U.S. bipartisan commission called the situation here “grave and deteriorating” and that the Bush administration’s policy wasn’t working, Rumsfeld showed no sign of backing down from his long-standing position that insurgent groups such as al-Qaida in Iraq must be crushed to keep them away from America. Full Story