This news story from public television in California says the top-two system has not worked as its supporters hoped. The story also focuses on the large number of congressional and legislative races with only two Democrats on the ballot, and on the fact that such races increase campaign spending.
IF an election system is math MORONIC on paper, then it will be math MORONIC in reality.
Thus the TIMEBOMB gerrymander systems in ALL States and in the USA Fed regime – H. Reps, Senate and Electoral College.
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NO HACK primaries.
P.R. and nonpartisan App.V.