Joe Biden and other moderate Democratic candidates opposed to “Medicare for All” have cast the plan as anti-labor, arguing it would leave union members worse off bystripping them of the health care benefits they painstakingly negotiated.But not all labor unions agree.

Only a few major unions have come out against the single-payer system that would all but eliminate private insurance, while many others remain undecided and some of the biggest labor groups in the country have embraced the plan.

Those supporting Medicare for All — or at least not yet ruling it out — say health care increasingly dominates contract battles, consuming bargaining power that could instead be directed toward raising wages and improving working conditions.

“When we’re able to hang on to the health plan we have, that’s considered a massive win,” Sara Nelson, president of the Association of Flight Attendants, told POLITICO. “But it’s a huge drag on our bargaining. So our message is: Get it off the table.”

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