Kaiser Permanente healthcare workers throughout Southern California have voted to quit the giant Service Employees International Union and join a smaller rival union, according to election results. The National Labor Relations Board said that about 2,000 nurses and care professionals voted more than 6 to 1 in favor of ditching the SEIU and affiliating with the rival National Union of Healthcare Workers. The SEIU is engaged in a battle for workers' allegiance with the emergent NUHW, headed by former SEIU leaders ousted a year ago in a takeover, the Los Angeles Times reports.