This appears more and more like the result of a man (Burkett) with a grudge. He was shown to be a liar and now he wants payback. And he used the one willing tool he knew woud play ball (because the head tool at that organization - Dan Rather - also harbors a grudge...against 41).
And the DNC made their own bed, because they were also tools who wanted to believe the memos. They sent out Harkin and made their stupid web video, all based on the forgery.
In the words of Nelson Muntz, Ha Ha.