Matt Mahan, the centrist Democrat and mayor of San Jose, announced on Thursday that he would run for governor of California, joining a sprawling but stagnant field to succeed Gavin Newsom. Mahan, 43, is a former tech entrepreneur who was first elected mayor of Silicon Valley’s largest city in 2022. Mahan has long been critical of Newsom, who is term-limited and cannot run again, over the governor’s approach to homelessness, crime reduction and even his social media taunting of the president. “They’re either running against Trump or they’re running in his image. But he has signaled an interest in running for governor for weeks.