You are so mind-killed that you non-jokingly advocated folk activism on Less Wrong as the first method to stop the "censorship of the internet".
I'm thinking that, with regard to this narrow issue -- SOPA -- the usual rules don't apply. I agree with you that most politics is green-team-versus-blue-team, and for this reason politics is the mindkiller. But I'm under the impression that both support and opposition to SOPA come from people on both the left and the right. Similarly, the CATO article you link to is correct in asserting that folk activism isn't going to make America roll back the welfare state. But SOPA isn't the welfare state. It has some politically-savvy interests behind it, Hollywood and the RIAA. That's important, but there are also some powerful interests opposing SOPA. The tech industry has tended to be politically naive compared to Hollywood, but it has money to spend, and the politicians know this. I bet the great majority of politicians who could never be persuaded budge on traditional political issues like social security or abortion might happily swing around on a technical issue like SOPA if they see the tide turning. And I'm told that the way to convince a politician who is open to being persuaded is a letter on paper.*
*Actually, the very best way to get a politician on your side is, of course, to convincingly indicate that a huge campaign donation and/or a guaranteed block of votes is likely to follow if they support your cause.
You make the unwarranted and incorrect assumption that "Left" and "Right" or "Democrat" and "Republican" are the only "Green" and "Blue" that matter here. You self-identify as tech-savvy? You will be mind-killed just as surely on an issue like this.
Referring, of course, to the proposed U.S. legislation which could cause severe damage to the Internet—at least, that's what a lot of people are saying. See, e.g., this Open Letter From Internet Engineers to the U.S. Congress (the first signatory listed is Vint Cerf). On Wikipedia, people including Jimbo Wales are discussing strategies as extreme as blanking the entire site (except for an explanatory message) to get people's attention, and thereby perhaps incite them to action, such as calling their Congressional representative.
I just happened to find out about all this a few hours ago, being someone who tries to avoid distractions like most kinds of news, so possibly others here with similar habits will appreciate having it called to ther attention. Or possibly they won't. But to those of you who possess relevant kinds of expertise:
(I think this subject can be discussed without political advocacy, in which I am mostly not at all interested anyway. It just looks like a practical problem to me.)
Edited to Add: I forgot to include a fourth bullet point:
It seems to have been assumed by many commenters, nevertheless.