In Australia, are parties a "first-class" part of the system? In the US, the historical animosity toward "factions" by the Federalists left us with a system where individuals are funded and the parties are independent corporate entities with their own rules but only de facto power.
In the US, a proportional representation system would have to be enabled by constitutional amendment, I think.
In the US, a proportional representation system would have to be enabled by constitutional amendment, I think.