They are neglecting the little detail -so I hear- that their Dan Rather's forged docs were also printed in leftwing gossip-rodent Kitty Kelley's "hate Bush" book.
I think he is definately implying that it is a plant. The following is from his blog today:
More to the point of the Killian memos: in 1844, campaigning on behalf of Whig nominee Henry Clay, kingmaker Thurlow Weed composed a newspaper article quoting a third party who’d supposedly seen the slaves of Democratic nominee James K. Polk branded like cattle with his initials. The Whigs later sent letters to Democratic leaders bearing the forged signatures of other Democratic leaders, forecasting horrific defeat and urging them to stay home from the polls. There was a damaging forged letter ascribed to James Garfield in 1880 (he won the election anyway, but was assassinated, and if there’s a lesson in there I don’t know what it is), and another forgery that contributed to Grover Cleveland’s defeat in 1888.
There is no conclusion here about the legitimacy of the Killian letters, although I will conclude by confessing that the Political Science Fiction explanation (these were literally designed to be discredited) appeals to me, if only out of a wish that these hack politicians would actually come up with something new and not merely repeat tactics which constitute the sole living legacy of long-defunct parties like the Federalists and the Whigs, for cryin’ out loud.
http://msnbc.msn.com/id/5660340