Just wanted to pop up for a second from my secure undisclosed location to note the following quote from Zbigniew Brzezinski from this interview in In The National Interest:

While at this stage it is too early to make any categorical judgments, it would appear that before too long, it is in the interest of U.S. credibility--especially the Bush Administration's credibility--to demonstrate tangibly that Iraq has--or has had--weapons of mass destruction.  (Since Saddam is fighting for his life it would be surprising, and rather strange, if he didn't use the weapons of mass destruction that he is said to have.)  Secondly, one would also hope that there will be more evident demonstrations that the Iraqi people are welcoming their "liberation." 

Both issues, after all, were central to the U.S. case for undertaking what has been undertaken.