Democrats who can unite the Country

[GoTfan]

Someone like Sherrod Brown or Tammy Baldwin. Midwestern progressives with establishment connections. Cory Booker has no chance with the activist base (Despite the borderline Republican beliefs of Blue Dog Moderate, who seems fine with Democrats being right-wingers). Same goes for people like Manchin (who's nomination WILL trigger a left-wing third party challenge).

But even then, it'd be an uphill battle for them. There are always going to be unsatisfied people.

[GoTfan]

John Delaney (the first democrat to announce a run for the presidency in 2020) and Joe Machine. That's pretty much it.

Manchin cannot unite the party. If he were to get the nod, then there would be a left-wing third party challenge, likely from Sanders or Warren that would cost him the election.