Kevin Carson articulates something I've been thinking but hadn't been able to put in words very well:
What are the most important issues in American politics? The ones you never hear about because the two major parties agree on them.
This points to something related that I've been thinking about: The real threat to liberty, at the moment, isn't right-wing religious fanatics who want to impose the Christian equivalent of sharia, or left-wing nutjobs who want to nationalize the economy; it's the so-called "vital center." Life under Christian reconstructionists or communists would be awful, but the chances of them taking over any time soon are slim. Most of the things I find most offensive, oppressive, and destructive about the state's current activities- the drug war is the big one here, but economic interventionism and public education rank highly too- are, indeed, the things that are simply taken for granted by both mainstream parties.
This seems to lend some credence to the increasingly popular notion that libertarians should try to recruit from leftists- however dreadful their proposed solutions may be, people on the far left are at least aware of the fact there is something terribly wrong with the narrow range of options permitted by "respectable" political opinion. They're less likely to be slaves to what "everyone knows" is acceptable, which creates an opportunity for libertarians. I'm less optimistic on this subject than the left-libertarians are, mostly due to observations made when debating with leftists on mailing lists during my my younger days, but I still think it's worth pursuing.