Philip Bump @ WaPo says in an analysis piece: Sanders wants Democrats to think that Warren’s gains are a function of moderates. They aren’t.

Excerpt (the whole has the pertinent graphs):

[....]  Patrick Murray, who runs the Monmouth University Polling Institute, noted on Twitter that the Politico article relied on the opinions of a few people in determining that more-moderate Democrats were lining up behind Warren. One, for example, was the co-founder of a centrist think tank that, Politico’s Natasha Korecki and Charlie Mahtesian write, “is learning to live with Warren.”

Murray noted that Monmouth’s polling paints a different picture than Politico’s interviews would suggest.

Interesting article, but this is anecdotal. Our polling shows that Warren’s rise right now is due to a solidification among the liberals. Not to say she can’t get centrist voters. It’s just not happening yet. https://t.co/LFDfNLwDoP

— Patrick Murray (@PollsterPatrick) June 19, 2019

And so it does. In Monmouth’s polls over the past few months, Warren’s surge has been a function of voters who identify as liberals. In April, she earned 8 percent of the vote among those who identify as liberal. In the new poll, she moved into a tie with former vice president Joe Biden [....]