<< I think that the origional stratergery was to repeat "Bush Lied " with no supporting facts so many times that the defense was exausted and simply allowed th naked assertion to stand.
<<But apparently the strain is starting to show on the strategisers. >>
Bass-ackward like everything else you write. "Bush lied" was a conclusion that started to become apparent on its own for some people as soon as they saw his lips moving, for others as soon as he made claims about WMD that were at odds with the accounting that Saddam gave to the UN and for many many more, as soon as it became apparent that there were no WMD in all of Iraq.
As the impression grew that Bush was a liar, based on nothing more than the exposure of his lies, the defenders of Bush began a campaign to extensively defend every lie, no matter how absurdly, causing those who knew that Bush had lied to go back and research what they already knew. Naively thinking that those who denied the lies were simply misinformed and would see the error of their ways.
The will to exhaust was always a factor, but it was the will of Bush's defenders to exhaust those who knew that Bush lied, and not the other way around. It was the will of the liars to exhaust the will of those who told the truth.