Prefer the real terms - "cover-up or whitewash"
I thought Burkett basically admitted to being the source when he said that "we have reassembled your records", and that he in turn took them to Cleland after getting the run around while trying to contact the Kerry campaign.
So if that is the chain of custody - Burkett, Cleland, Kerry campaign - then obviously Rather got them from the Kerry Kamp. Burkett has already taken away the possiblity of denial for CBS. They have nowhere to run or hide now.