SACRAMENTO, Calif. (AP) — A major union announced a proposal Thursday to impose a one-time 5% tax on billionaires in California to address federal funding cuts to health care for low-income people. Proponents, including the Service Employees International Union, hope to place the statewide measure before voters next year. The tax would be on the net worth of California’s richest residents. A small portion of the money would also help fund K-12 education since the federal government has