The May 22 Sacramento Bee, the largest newspaper in California’s capital city, has an op-ed advocating that the California top-two system be abolished. It is by Steve Maviglio, a Democrat, and Ron Nehring, a Republican. Here is a link, but it is behind a paywall. It demonstrates that the top-two system has not helped moderates to get elected, and points out that the California legislature is still one of the most polarized in the nation. It lists instances when a major party incumbent sponsored advertisements referring to that incumbent’s most feared opponent in a way to boost another potential opponent who would be weaker.
It doesn’t mention the flaw that the system has blocked all minor party candidates from the general election ballot, except in races when one of the two major parties didn’t run anyone. It does mention that the system has not helped independent candidates, as the top-two backers expected. Thanks to Eric Wong for the link.