I don't mean that the two party system we have is due to first-past-the-post, it almost doesn't even really matter why we have it. But first-past-the-post is th

I don't mean that the two party system we have is due to first-past-the-post, it almost doesn't even really matter why we have it. But first-past-the-post is the mechanism which currently entrenches it and is the most likely to change. I think that (3) is a result of the system, not a cause.