One of the most powerful unions in California politics just made its move in the governor’s race, and it tells you a lot about how the state’s political machine works. The Service Employees International Union (SEIU), one of the most powerful unions in California politics, endorsed Democrat Eric Swalwell for governor last week.  It’s an endorsement that tells you a lot about how the state’s political machine works. For a candidate looking to build momentum in a crowded Democratic field, the