Along with some differences over how to best get from point A to point B (such as how to get from the current health care system to a universal health care system). What Sanders and his supporters don't seem to understand is that they're cutting off their collective nose to spite their collective face. There is power in numbers, and if you want to bring about progressive policy, we first need to increase the number of Democrats in power. Logic 101, folks.
Colorblind racism is a real thing. Sanders and his supporters don't seem to realize or care that they often sound just like a Republican arguing against affirmative action when they talk about race, while promoting the bullshit narrative that other Dems only want to elect women and POC for the sake of electing women and POC. Not a single Democrat is making that argument, yet you wouldn't know it from many of the DU posts that argue Dems are doing just that. It's insulting and ignorant.
After the 2016 election, Sanders (at a post-election town hall in Wisconsin) helped push the notion that most Trump supporters aren't racist and that they're just driven by economic anxiety. And that Democrats talk too much about identity politics and not enough about economics. Never mind that both of those narratives have been proven false.
1) https://www.vox.com/identities/2017/12/15/16781222/trump-racism-economic-anxiety-study
2) https://www.vox.com/policy-and-politics/2016/12/16/13972394/most-common-words-hillary-clinton-speech
And let's not forget his excusing those who aren't "comfortable" voting for a Black man.
In one breath, it's bashing identity politics. In the next breath, it's "let's talk about the white working class" ('cause, you know, white isn't an identity).
Sanders is essentially done after New Hampshire. The only question is, will he leave gracefully?