The American Interest is a bimonthly print publication, founded in 2005. Among its founders are Francis Fukuyama and Zbigniew Brzezinski. The current issue carries this analysis by Luke Phillips, about the California top-two system. He writes that it has not worked as its backers hoped. Instead of boosting centrists and moderates, it has exaggerated the dominance of the Democratic Party and transformed California into a one-party state.
The article is not perfectly accurate. Phillips seems to believe top-two wasn’t used in California until 2014, but it was in effect starting in 2011. Also Phillips doesn’t seem to realize that before top-two started, independent voters were permitted to vote in all Democratic and Republican primaries for congress and partisan state office.