One additional thought, first past the post is 1 more step toward pure democracy, all of which are doomed to failure. This is because of tyranny of the majority.
Few realize in anymore, because such things are no longer taught, but we live in a republic. We democratically elect our reps, but even this breeds corruption. Sometimes we have to stand for what is right. What happens if some yahoo blocks legitimate legislation? Well, he'll soon be exposed to his constituents at the polls. Founders had lots of stuff correct from the start.