It’s really, really good — an uncommonly hysteria-free discussion of the subject. You can listen to it here.
The SPLC, which has tracked far-right extremist groups for a long time, recently starting tracking “eco-terror” groups (some material here and here). Mark Potok makes no excuses for their behavior, but he makes it very clear that they are nowhere near the “top domestic threat.” And Lewis makes some fantastic points, many of which I have made myself in my obsessive blogging on the subject, and provides some interesting historical context.
(via Judith herself!)