The decline of the leftwing netroots into one great, venomous snarl is far advanced, well-known, and much remarked upon by political observers from across the spectrum. But even given its deserved reputation for poisonous invective, the assault mounted against General David Petraeus surprises. General Petraeus made the unforgivable mistake in their eyes of appearing on my radio program and answering questions. (The transcript is here and the audio is here.) Both because he agreed to be interviewed by a journalist favorable to victory and supportive of President Bush and because his answers suggest progress is being made in Iraq, Petraeus...