A legislative assembly should be as nearly exact a copy as possible of the people it governs, if not demographically, then at least in terms of their political views. But a two-party system is a distorting funhouse mirror -- some features exaggerated, others diminished to invisibility.
The downside of a multiparty system is instability -- Italy seems to average a new government a year since WWII. But that comes of combining a multiparty system with a parliamentary system where the legislature elects the executive -- which requires putting together COALITIONS to form a majority. The problem would not arise in a presidential or separation-of-powers system. Coalitions would be issue-specific, like the Libertarians and the Greens joining forces to legalize marijuana, even if they can agree on nothing else at all.
The best ways to facilitate the evolution of the American two-party system into a multiparty system are these:
https://en.wikipedia.org/wiki/Proportional_representation
https://en.wikipedia.org/wiki/Electoral_fusion_in_the_United_States
https://en.wikipedia.org/wiki/Instant-runoff_voting
https://en.wikipedia.org/wiki/Ranked_voting
The downside of a multiparty system is instability -- Italy seems to average a new government a year since WWII. But that comes of combining a multiparty system with a parliamentary system where the legislature elects the executive -- which requires putting together COALITIONS to form a majority. The problem would not arise in a presidential or separation-of-powers system. Coalitions would be issue-specific, like the Libertarians and the Greens joining forces to legalize marijuana, even if they can agree on nothing else at all.
The best ways to facilitate the evolution of the American two-party system into a multiparty system are these:
https://en.wikipedia.org/wiki/Proportional_representation
https://en.wikipedia.org/wiki/Electoral_fusion_in_the_United_States
https://en.wikipedia.org/wiki/Instant-runoff_voting
https://en.wikipedia.org/wiki/Ranked_voting
