On April 13, U.S. District Court Judge Maxine Chesney mostly upheld the California top-two system. Here is the 26-page decision. The judge did find problems with (1) the state’s refusal to let members of unqualified parties have their party label on the ballot; (2) the early filing deadline in presidential election years, which is in December of the year before the election. So the plaintiffs are free to amend their Complaint with more details about how those two provisions are faulty.
For the main issues in the case, the judge simply relied on the fact that the State Court of Appeals upheld the top-two system in 2014, and the same plaintiffs in the current case were mostly in the 2014 case. The 2014 decision was deeply flawed and factually incorrect. It said that the state interest in a top-two system was to let independents vote in primaries, and stated erroneously that before top-two came into existence, independents could not vote in Republican and Democratic primaries. The reality is that there are many types of primary systems that let independents vote in primaries, and yet don’t restrict access to the general election ballot. But Judge Chesney did not delve into problems with the 2014 decision.