Political insiders expect San Jose Mayor Matt Mahan to announce his candidacy for California governor on Thursday. Politico today published a speculative piece on the San Jose mayor’s candidacy, headlined “The case for (and against) a Matt Mahan run,” saying the mayor’s bid would “upend” the high-profile campaign for California’s next governor. Politico reported that Mahan was “seriously considering running for governor and he’s had calls with supporters and donors in recent days to gauge their support.”“I’m listening and learning a lot, and heavily weighing this potential run,” Mahan is quoted as telling Politico’s Playbook late last week. He took the unusual step last month to invite gubernatorial candidates to San Jose to tour his temporary homeless shelters. After Harvard, Mahan spent a year building irrigation systems in Bolivia, then taught English and history at Alum Rock Middle School in San Jose for two years.