For example, if you remember Bush and his administration have always called for the destruction of "terror networks" instead of just calling for the capture or death of Osama Bin Laden. The faulty thinking of the democrats/liberals is that Al Queda is a top down organization and when OBL goes, then we can call the war success since he leads Al Queda and is the source of their funding.
Now if anyone did a little research in the media or at the DNC you would know that this is not the case. Al Queda has its own disaster recovery plan should OBL die so that these savages can continue their dirty work. All you have to do is read a best seller like Stephen Emerson's American Jihad to understand this. But apparently liberals are not too keen on doing any homework.
A more sinister explanation of their ignorance is that since OBL's body has not been found, then they can lord it over Bush for political purposes. They then claim that Bush has failed since OBL has not been caught or killed, with the reality being that it Al Queda and other terror networks are much bigger than that.