I would put my money on the Shinseki faction in the Pentagon. Just a guess, but I know lots of people hate him.
We used to have an under-employed civilian worker from the Pentagon (he really was) who posted here regularly. He was extremely anti-Bush, anti-Rums and anti-WOT and made a habit of using Pentagon computers and internet access to press his agenda...which of course made him popular with one element on FR.
When his employers were informed of his use of government time and property he quickly disappeared. No loss.