Poll: Bush credibility down By Richard Benedetto, USA TODAY WASHINGTON — President Bush's credibility rating is down since his former counterterrorism chief went public last week with accusations that Bush minimized the al-Qaeda threat to focus on getting rid of Iraq's Saddam Hussein, according to a USA TODAY/CNN/Gallup Poll. The Bush administration did not do all it could to prevent the attacks, 54% say, and 53% say the White House is covering up something about its handling of intelligence before Sept. 11. Still, 67% say the administration should not have been expected to prevent the tragedy. But Americans' doubts have...