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Now I'm not sure if they're going to mean to do it when they do it, but the party is split down the middle by what's effectively a twitter war

There. FTFY.

Just about all the polls show that the "war" within the Democratic Party is primarily a small number of folks duking it out on Twitter, not a huge split in the party. What's more, there are huge numbers of Democrats who don't care which candidate gets the nomination, as long as they can vote against L'Orange.

Let's not forget that it was ~70,000 votes in three states (WI, MI, PA) that got Trump elected. In 2016, turnout was down in the urban areas of WI and MI, but slightly up in PA. As such, as long as the Dems can turn out their base (which they failed to do effectively in 2016) in those three states, Trump will lose in 2020.

Note that it was only ~10,000 votes (0.77%) in WI, ~11,000 votes (0.23%) in MI, and ~49,500 votes (0.72%) in PA that put Trump over the top.

It was clear *during* the 2016 election that the Democrats needed to pay more attention to those states, but did not do so. I suspect they won't make that mistake again.

There was no "landslide" for Trump, nor was there any great groundswell of support for him specifically. In fact, the difference lay in lower turnout by African-Americans (vis a vis Barack Obama) and gullible older white folks who believed all the disinformation about Hillary Clinton (PizzaGate, Seth Rich, inaccurate details of how Clinton Foundation donations were/are spent, etc., etc., etc.).

As such, any reasonable candidate should have no problem defeating Trump, as long as they make sure to turn out the D base and remind folks that we don't need a lying, obnoxious, dishonest amateur in the White House.