I agree that our political system is a train wreck, but I don't see why the political positions of the people you're suggesting amend the Constitution wouldn't be relevant.
Plurality voting systems lacking runoff elections lead to two-party states. Maurice Duverger pointed this out in 1964.
The Convention of States is a campaign by the Tea Party movement to form an Article V convention, but they are more likely to present a balanced budget amendment, not electoral reform. Key people involved like Jim DeMint have also advocated for a constitutional ban on same-sex marriage—a pretty silly idea if you ask me.