Given his history with mental illness and festering grudge, Burkett certainly does not qualify as an unimpeachable source. But they are doing there best to point us in his direction.
Major Players:
Robin Rather
Dan Rather
Barnes
Burkett
David Van Os
David R. Richards
Ann Richards
DNC/Kerry Campaign
Paul Begala (just becasue he is from Texas)
All dedicated to the destruction (not just defeat) of George W Bush
Do not forget Dan's Rather's disgust when Ann Ricahrd's was defeated. Would Ann or husband be considered unimpeachable?
This may be a point of interest. Most Kinko type places have video monitors. The fax usually indicates a date and time. Would it not be of interest to review the video's of the time an place in question? Not that CBS would have any interest in revealing that.