You could duplicate the system - so you have something like "White House 2" and "anti-White House 2" - try to get each group to focus on getting their ideas / f

You could duplicate the system - so you have something like "White House 2" and "anti-White House 2" - try to get each group to focus on getting their ideas / facts / opinions organised rather than on sinking each other ships. It'd potentially stop each of them from polluting the other, although you'd probably have to have somewhere designated as middle ground for those that want to debate things. There are other ways to partition the two groups, but having a way for them to come together as well would be interesting. If as well as "Endorse / Oppose" you had "Thought provoking / not" then you potentially slip the more thought provoking ideas from one area across to the other (tagged as having come across from the other side). You might have to start a new set of comments when it moves across so the old discussion doesn't get derailed, but at least it lobs various ideas over the fence.