“We defeated Trump last year, and thank you, but we haven’t defeated Trumpism,” the governor has repeated for the past two weeks in a blitz of campaign stops and Zoom calls. From vaccine resistance to climate denial, he says, everything that terrified California liberals about the last president is on the ballot. And far more than his own personal future hangs in the balance: “This is a matter of life and death.”…

By invoking Mr. Trump as his opponent of choice, Mr. Newsom is reprising a message that he has used in the past to blunt criticism effectively, while also testing a strategy that is likely to be echoed by Democrats seeking to mobilize voters in midterm races across the country next year.

In effect, the leader Californians elected in a 2018 landslide is running less on the Democratic policies of a Democratic incumbent than on an urgent if familiar call to action against an existential threat to blue state values.