I've argued against this framework before, but its worth repeating. "Extremism" is not inherently wrong. Nor is it inherently insane. Copernicus was an "extremist" for suggesting that the Earth actually revolves around the sun. Gallileo was so vocal about this "extreme" idea, the Church went after him. Also, they were both sane in an insane world. And, as Orwell might have put it, I suppose if "70 to 80% of our population" thinks that 2+2=5, then it is, the truth be damned.
Medea Benjamin, the cofounder of Code Pink, described Jon Stewart's position as "slacktivism" which absolutely describes what this rally is about. After all, Jon Stewart suggested that the people at the rally might "need to go home at 6" and aren't usually out there because they have "actual lives." Medea Benjamin was put in a skit last night, grouping her with an anarchist, a tea partier, and a guy wearing a giant Ahmadinejad head. Her article can be found here: http://www.commondreams.org/view/2010/10/27-6. Code Pink, its worth noting, is a prime example of sane extremism, because, at least in this country, its viewed as insane to demand an end to war.
We need a little more sanity regarding the issue of "extremism," and what it really means. This rally is intended to replace real sanity with centrism. With a "centrist" government moving government policy further to the right every day despite the insanity of the previous administration, this is not what we need right now.