In terms of direct links to 9/11, there were indeed links to terrorists who linked either directly or indirectly to global al Qaeda (though, to the anti-Bush crowd, what rises to the level of a legitimate link would have to be something along the lines of a Ba'athist intelligence officer making love to Osama bin Laden in the presence of George Tenet, Robert Mueller, and film crews from the big three television networks).
Somehow I think they would even turn a blind eye towards that...
The real problem is that the GOP is not forceful enough to debunk these claims.... You would think that the GOP was afraid to toot its own horn....
They need to be out front on successes in the GWOT and saying things like if we had not went after Saddam he would have continued to use the Oil For Food scam to bilk millions of dollars from France and Russia that he used to support terror groups.... thousands of American Citizens would be dead today because of how emboldened Saddam became after UBL 911 success... also ... include questions like... Was keeping Saddam in power worth the risk that terrorists would have already blown up the elementary school on Main Street USA where your kids attend.... By acting we have quantifiably saved American Citizens lives....