Interesting question, let's speculate. Remember in Rathergate when CBS claimed their 4 faxed memos were backed by "um impeachable sources"? It turned out that there was only 1 source, Bill Burkett, a wackjob twice committed to stays in mental hospitals, and who was also a rabid left-wing Democrat that had been after the Bush family for over 30 years. "Impeachable", my derriere!
Whatever source they had in the Pentagon was obviously a flake because even Newsweek said that on further questioning he/she couldn't back up his/her Koran flushing story.
They hung their whole story on one person that couldn't verify his/her claim afterward, and Newsweek claimed that they had earlier approached two other "sources" for confirmation, but one "source" wouldn't answer, and the other denied it. And those jackasses still ran with the story.......they must have wanted it really bad.
Exactly what I thought of. CBS protected the source, even though they were deceived. Why? No doubt that in both of these cases the source will turn out to have links to the democrats.