San Jose Mayor Matt Mahan has come out against a controversial proposal to create a \u201cbillionaire tax\u201d in California. Backers see it as a means of filling a massive deficit facing the state\u2019s health care\u00a0system. In a nearly 300-word thread posted to X Monday, Mahan warned if passed by voters, the pending statewide ballot measure would drive wealthy entrepreneurs out of California, sapping the state\u2019s tax base and undermining its economic dynamism. \u201cWe need a rising economic tide to lift all boats, not a political plan that will sink California\u2019s innovation economy,\u201d Mahan wrote. The post is just the latest…<\/p>\n