The Dems have not been so fractured since 1968. Some have depressed memories of the last time they went far left (McGovern) against a wildly unpopular Republican (Nixon) and only carried Massachusetts and DC, while others are freaked that the recent election in England suggests a similar trouncing. The issue is... what to do with the ideologues who seem so uncompromising and might even desert any moderate who might sneak in out of spite.
Link: https://www.realclearpolitics.com/elections/betting_odds/democratic_2020_nomination/