Political discussions tend to derail into ideological rants far more often than technical matters. They also tend to turn into echo chambers, attracting like-minded individuals who circle-jerk their own opinions.
That said, I'm a fan of Debate and Discussion subforum of SomethingAwful, which is remarkably intelligent and reasonable (although admittedly slanting heavily towards liberals and libertarians).
That's where the comment voting would help, but I guess it's still not a perfect system. I really just want a place where I can have political discussions/debates with people who form their opinions based on facts instead of being strictly democrat/republican because that's the way their parents brought them up.
That said, I'm a fan of Debate and Discussion subforum of SomethingAwful, which is remarkably intelligent and reasonable (although admittedly slanting heavily towards liberals and libertarians).