Forget Bernie vs. Warren. Focus on Growing the Progressive Base and Defeating Biden.
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Liberals in the U.S. often say the Trump presidency is Not Normal. And yeah, its a killer-clown horror show. But the truth is that from most outsider perspectives, there is nothing about U.S. politics that is normal particularly the interminable length of campaigns. Normal countries have federal elections that consume two, maybe three months of peoples political lives once every four to five years; Canada caps federal campaigns at 50 days, Japan at 12. In the U.S., on the other hand, theres a total of about nine months in every four-year cycle when politics is not consumed by either a presidential or midterm horserace.
Its a spectacle that comes at a steep price. The relentless process of picking electoral winners sucks up intellectual energy, media airtime, movement muscle, and boatloads of money that are badly needed elsewhere. Like organizing to stop war with Iran, for instance. Or supporting movements trying to free migrants from Trumps concentration camps. Or figuring out what a transformative Green New Deal should look like on the ground. Or building international alliances with people in countries facing their own hate-filled authoritarian strongmen.
Theres another reason to resist attempts to turn Sanders vs. Warren into a redux of the 2016 primaries eight months before the first vote is cast. Todays electoral dynamics are absolutely nothing like 2016. That was a two-way race between two candidates with radically different records and ideas, in which one candidates gain really was the others loss. A winner-takes-all race like that pretty much always turns into some kind of death match.
These primaries are another species entirely. There is a small army of candidates, with two of the leaders running on platforms so far to the left, they would have been unimaginable for anyone but a protest candidate as recently as 2014. The frontrunner, meanwhile, is eminently beatable (especially if Joe Biden keeps showing us exactly who he is, as he did about six times this week).
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https://theintercept.com/2019/06/21/bernie-sanders-elizabeth-warren-progressive/
This is a good read.