Your analogy is broken. Or at least- it fails to understand Sander's supporters (and perhaps the man himself).
Most Sanders supporters do not view corporate Dems like Biden as being a part of the same team. We might swallow our vomit and vote for the guy because the other option is Trump, but somebody who is
fighting us on Medicare for All, student debt relief, the seriousness of climate change, marijuana legalization and the such is NOT on my team.
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This image (which was shared by a Warren supporter on my FB feed) might be a touch hyperbolic, but the reality is that Joe is anti-progress. And for many, our hopes and desires for this country have not been lowered (by Trump) to the point where anybody who might be able to get rid of Donald suddenly = the same team. See Romney, Mitt.
All of this to say- the reason Sander's supporters got so wound up over the Warren thing is because we viewed her as the same team. Her and Sanders align on almost all matters related to policy, and we viewed her end goal as (for the most part) our goal. Which is why I cared far more about stopping Joe than I did who would be the nominee between Warren and Sanders. And why she has been criticized the way she has.
In contrast, it is currently Sanders job to push Biden as far to the left as possible. Which, at the very least, means not dropping out until after the debate even though everyone involved knows it over (barring a miracle). And just like last time, Bernie staying in the race allows him to rack up more delegates and influence the platform at the convention. Because a Biden presidency needs to look more like a team Sander's supporters want to join-- or a lot of them will stay home. Maybe that won't matter and it can be made up via suburban voters.
But right now my Facebook wall is full of people sharing this quote:
“First, I must confess that over the last few years I have been gravely disappointed with the white moderate. I have almost reached the regrettable conclusion that the Negro's great stumbling block in the stride toward freedom is not the White Citizen's Council-er or the Ku Klux Klanner, but the white moderate who is more devoted to "order" than to justice; who prefers a negative peace which is the absence of tension to a positive peace which is the presence of justice; who constantly says "I agree with you in the goal you seek, but I can't agree with your methods of direct action;" who paternalistically feels he can set the timetable for another man's freedom; who lives by the myth of time and who constantly advises the Negro to wait until a "more convenient season."
- MLK
Now- of course- the irony is that it's largely been older black voters pushing Joe towards the nomination. But that doesn't change the fact that I am already seeing certain circles (particularly my Latino friends) who are pushing the idea that "maybe middle class whites need to suffer more before they will the light"-- even after the past four years have shown the dangers of that assessment.