Joe Mathews, a commentator on California politics, here writes that if California Democratic legislators and Governor Gavin Newsom really believe in the idea that candidates should be kept off ballots if they don’t reveal their income taxes, they ought to put a proposed state constitutional amendment on the ballot. If such an amendment passed the legislature and then the electorate also voted for it, then there would no longer be a state constitutional barrier to the law that the legislature passed this year, requiring presidential primary candidates to reveal their tax returns.
Of course, even if all that happened, there is still no guarantee that such a tax returns-ballot law would be constitutional under the U.S. Constitution.