Sanders Super Tuesday problem seemed to be that despite huge numbers at rallies, the surge in voters did not occur among the younger voters that Sanders said he would bring to the Democratic Party. His problem was the voters, not the billionaires. Biden had virtually no ground game in Minnesota, but won the primary. Biden won in Massachusetts, in Bernie's backyard. The turnout surge went to Biden.

Bernie may regain his footing in Michigan.

We have gendered categorizing, and Warren received some very unfair dismissal, but some qualifiers:

1) Warren is a research tank/legal team wonk type who's evolving into something else. "librarian" academician isn't that far off

2) yes, Mutti is one classic role type mixed with politics/work (Madeleine Alright, Queen Victoria... matriarch. Anna Soubry in UK politics is a bit less matriarch, a bit just organized, expressive, cut-thru-the-bullshit politician -Nicola Sturgeon in Scotland is similar). We also have Kamala Harris as lawyer/litigator type - if you watched Suits, the black female head of the firm is a smoother, more savvy Kamala, and you can compare the different male partners as other stereotype exec models (boyish plays hard breaks rules, heavy presence but slower more methodical, abrasive climber...). Sheryl Sandberg might be an example of that in the real life business exec works. Jacinda Ardern, NZ PM, is probably our most evolved example of this in real life, including that great and difficult mix of mother + professional. (I don't know Warren's personal life, but she comes across as childless, which we sexist humans detect and judge and categorize, and at her age that drifts towards spinster vs matriarch, though give us 30 years it'll be more normalized). 

3) in an exec job search the best mix if qualities might win, or it still might be that the most extreme in X rises above. In politics it's the extreme - Bernie is the firebrand, Joe is the not too swift nice good looking guy, Pete won the next-generation category over Beto (and more unfairly over Booker), Bloomberg found no oxygen in a less likable but more savvy Biden with money and more atavistic politics. Liz is identified too close to Bernie, partly her own fault, and her master regulator credentials havent stuck out accordingly - she is an older Sandberg type but old and Silicon Valley don't really jive, so it doesn't project easy. Instead it's "wonk" (or "geek" for boys)

4) none of these were great choices. There was no Blair or Trudeau or Macron or Ardern or Obama or dare I say it as half Mutti/half wonk/half-Ardern Hillary. We're still stuck waiting for our next American Idol. Booker didn't charm and dominate enough, Klobuchar was too 2nd tier, Harris is not enough smooth politician (yet?)...

5) the myth of the uncompromising revolution on the left should be dead. The youth vote didn't turn up and won't, and the transition from caucuses to primaries shows less actual support than promoted. What this may mean is that in the future the more pragmatic leftists can get some air to develop a more European platform, rather than having to swing hard for the far left bleachers to satisfy that litany of not enactable demands. There may be a chance to actually discuss pragmatic global warming, health care, wealth redistribution, et Al in a way that doesn't scare and threaten to tear down the house. Michael Bloomberg tossed away a half billion dollars - Hillary's total 2016 spend - without a sweat, nothing happened. Jeff Bezos can do the same, and on and in. We don't have infinite billionaires, but enough vats to tap for *something*, not everything.