Anyway see
here if you're interested; Walter's pointing out that, if you do not want someone else to force their political philosophy onto you, you shouldn't do the same; to do to others what you would
not want to happen to you is immoral, for it is inconsistent and requires one group of people (even if it's just you) to have special rights over another, i.e. the state in microscopic view.
Though this may look very true, I wouldn't take this logic as definitive. Actually, there are many other ways you can instill your political views or philosophies onto your opponent (this thread can be a good example of this), even without sticking to force, if this was your point...