I don't understand why Bush just doesn't come right out and say that the administration was wrong about WMD, and get on with life? Isn't it just fueling the fire of opposition to continue to insist that there are WMD waiting to be discovered?
If I were him, I'd come clean, admit that they had made a mistake about the WMD, and then focus on the fact that Saddam was a bad guy, etc. I think the country would accept the explanation that certain intelligence led us to believe of the existence of WMD in Iraq, and that unfortunately, that intelligence was flawed.
The only reason I can think of that they are not doing this, is because either they still really believe there are WMD to find, or they purposely used the WMD as a rallying point for support, when in fact they knew they did not exist.