The largest federal workers' union this week threw its support behind a Republican government funding bill , ratcheting up pressure on Democrats. But many of the top labor unions told ABC News that they continue to back the strategy taken up by Democrats, breaking with the American Federation of Government Employees (AFGE), which represents hundreds of thousands of federal workers losing out on pay and staring down the threat of layoffs. Many labor unions, a key bloc within the Democratic Party, support the push for an extension of Obamacare subsidies and remain eager to fight a president they view as an adversary of workers, some labor analysts and union officials said. Jaime Contreras, an executive vice president at the 185,000-member Service Employees International Union Local 32BJ, sai

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