If the U.S. system of single-member districts with plurality voting were replaced with a system of proportional representation, one possible consequence would be:

Question

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Moving to a proportional representation system would make it easier for smaller parties to emerge. If the election system was changed so that, for example, the top three vote earners in an election each got a seat, it would strongly encourage smaller parties to run candidates. It's much easier to come in third than to come in first.

If the US System of Single-Member Districts with Plurality Voting Were Replaced