Pride goeth before a fall:
In addition, the documents are backed up not only by independent handwriting and forensic document experts but by sources familiar with their content. Contrary to some rumors, no internal investigation is underway at CBS News nor is one planned. We have complete confidence in our reporting and will continue to pursue the story.
Doesn't this sound an awful lot like:
I don't fall down. That sonofabitch ran into me.
Amazing, really. Not even a "we're looking into it" or "we will prove our sources our good" but mostly a "we don't make mistakes."