WAR POWERSThe carefully timed and planned PR blitz beginshttp://www.cnn.com/2007/POLITICS/09/03/bush.iraq/index.htmlPresident Bush arrived at an air base west of Baghdad Monday on an unannounced visit, the White House said.He plans to meet face-to-face with top military commanders, the U.S. ambassador, Iraqi Prime Minister Nuri al-Maliki and provincial tribal leaders. It is the president's third