"Duped," my ass.
CBS, in single-minded pursuit of its anti-Bush agenda, snapped up even the most unreliable information to back up its thesis, and dismissed any pro-Bush information that didn't fit the picture.
They walked into this deliberately, counting on the usual assumption of their omniscience on the part of its audience.
Right now, they are doing their best to paint this over, hoping to God nobody follows up on the full geneology of these documents. We'll see.