Other candidates who will run, but probably shouldn't:
Kamala Harris: She's not a bad lady, but she'll rightfully be seen as having shifted away from corporations only when it was convenient. This will cost her in authenticity. She'll attract a lot of progressives and split the progressive vote, largely because of being a women of color and from California, so home state advantage in a major Dem state plus she'll get a good chunk of the identity politics people.
Kristin Gillibrand: She's another one that suddenly sprinted left and away from corporations when it was politically convenient, except even worse than Harris. She's positioning herself as the most anti-Trump voter in congress, even more so than Bernie and Warren, but it's fake and many people know it. She's basically Hillary with a different face and name. She'll draw the rest of the identity politics crowd, some liberal Hillary fans, and a few progressives whose main passion is women's issues.
Cory Booker: Another "progressive" hero that still occasionally cozies up to corporate interests, he hasn't moved as much since the election, but also didn't have as far to go. His successful effort as one of the few Democrats that voted to stop imports of cheaper Canadian medicine doesn't fit with neither the free trade Democrats nor the "think of the common man" Democrats, and reeks of corporate interests. His authenticity is damaged and he doesn't have the time or platform to repair it. He'll just drag down the progressive vote further.
Joe Biden: Would he win? Probably. But would he solve anything with how divided the country is right now? Probably not. Like really, sure Joe is a likable enough guy that would probably beat Trump as someone the white working class would feel comfortable voting for, but Democrats are accused of not standing for anything, and Joe would perpetuate this problem, and would look like more of the status quo. Even if he'd win, he's not what the Democrats or America needs right now. What's the point of Joe?
Cuomo: Something something experience, something something infrastructure. Whatever, he reeks of corruption. Trump is corrupt too, but we need a clear contrast. He'll probably run anyway.
People who might run, might not, but shouldn't.
Bloomberg: See Cuomo above, just with a different billionaire flavor.
Clinton: Blech. I don't think she will, but people keep saying she might. Only advantage is she'd draw away from Biden's vote, and I guess that goes for Bloomberg too. I still think they shouldn't run. They'd just make our whole side stink. Clinton has lower favorability now than when she first came to the White House as a relatively unknown First Lady. She still has her rabid followers though, and people that feel they need to defend her to justify their vote for her. If she wants to weigh in on issues or candidates, whatever, but she shouldn't ever run for any office ever again.