I think you could break it down to the northeast and west coast wanting someone more liberal/progressive while most of the rest of the nation want a more moderate candidate.

Looking at the regional breakdown by a YouGov poll shows the democrats of the Northeast prefer Warren over Biden 37-19 and in the west 26-16. The midwest and south prefer Biden. Question 45

https://d25d2506sfb94s.cloudfront.net/cumulus_uploads/document/7umtlf80ov/econTabReport.pdf

Regardless of who the Democrats nominate is, we already know the northeast and west coast is going very heavily Democratic. Adding Illinois that 218 electoral votes in states that the Democratic candidate will win by 15 million plus popular aggregated votes.

It's the Midwest where you have your battleground states, Pennsylvania, Ohio, Michigan, Wisconsin, Minnesota, Iowa. It's the midwest that prefers Biden. You can add North Carolina, Georgia and Florida in the south's battleground states that also prefer Biden.

We know regardless of who is the democratic nominee, Biden, Warren, Sanders, Gaylord Cumquat from the neither regions are guaranteed those 218 safe/solid Democratic states. What we don't know is who has the best chance in winning states from the Midwest and South.The battleground states.

This is a problem for the Democrats to figure out.
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It's high past time that we start electing Americans to congress and the presidency who put America first instead of their political party. For way too long we have been electing Republicans and Democrats who happen to be Americans instead of Americans who happen to be Republicans and Democrats.