Simple, They will expose that Our Troops did find Iraqi Nukes and That President Bush secretly has hidden that from the American public since the invasion.
Expect a lengthy diatribe on how President Bush betrayed the public trust by not telling the country that Saddam did indeed have nuclear weapons and that some of those weapons were transfered into Al Queda's hands just before the invasion and are presently unaccounted for.
Followed by of course if we hadn't invaded Iraq, Saddam never would have given Al Queda the nukes it needed to launch a nuclear attack against us at will.
The summary will of course call for the immediate impeachment of the President.
If Saddam did have nukes, they would almost surely have had Russian markings on them. If not Russian, then what? French?
That is a good theory. The Slimes could release it 4 days before the elction in the hopes that the voters will not soon enough recognize the cognitive dissonance involved in believing that Saddam did not have WMD, on the one hand, and that Saddam passed WMD to Al Queda, on the other.