Back when I first started blogging, a common name that cropped up on liberal blogs was that of David Horowitz, a guy who apparently was a liberal at one time but became a conservative, and one of the most intellectually dishonest ones alive. I hadn't seen Horowitz mentioned in quite some time, though, until today, when I see that he engaged in an e-mail "debate", edited the replies he received, and then responded to the edits alone. And apparently Horowitz didn't think that his interlocutor would (a) notice, or (b) still have his own e-mailed responses to the questions asked.
I'd call Horowitz a hack, except that would be an insult to hacks.
(Link via Dr. Myers.)