Whether Warren’s regression and the fall of support for Medicare for All is a matter of correlation or causation has become the topic of intense internal debate in Democratic circles. And for the Senator’s more moderate competitors in the primary, the conclusions are fairly easy to draw: the shifting tides of opinion on health care are damaging her candidacy.

“I think it’s that Medicare for All is poison,” said a senior aide to another 2020 Democrat. “It is fucking poison. You touch it, you turn to dust.”…

“People really like Warren and on the merits, and they probably would pick her as the nominee,” said Adam Jentleson, a Democratic operative who may be the Senator’s most pugnacious supporter online. “But the biggest fear about her is electability and you had a month where those fears were exacerbated from the New York Times poll [showing Warren faring poorly in swing states] to people turning Medicare for All into an electibility issue.”…

“The more voters learn about what Medicare for All really means for their families and their pocketbooks, the less support it has,” said T.J. Ducklo, a spokesman for former Vice President Joe Biden’s campaign. “Democrats won the House of Representatives in 2018 on the back of a relentless campaign to protect the Affordable Care Act, and we’re not going to beat Donald Trump in 2020 with an unpopular and ineffective message on the issue voters care most about.”