I wonder if the two dominant political parties in America have pledges to stop any non-purists from (gasp!) joining their party....Nope. Hmmmm...I wonder why they're so successful?
Well, they're not "principled," though. So what if they keep winning all the elections and using their ever-increasing power to destroy liberty. Libertarians, thank you very much, would rather keep their principles. You see, for them, principles are more important than liberty.
Wait a minute...
UPDATE: For comments, see the original blog post here.