Let's look logically at the scenario posed here:
Hillary v. Michelle O v. Elizabeth Warren.
Hillary simply is political toast---even the most LIBERAL wealthy financiers are NOT putting their money on someone who will again FLOP out and lose the 2020 POTUS election, so she's out.
Michelle O v. Elizabeth Warren:
Michelle Obama may be flattered of the suggestion posed that she make a POTUS candidacy run---but she's savvy enough to realize that America won't support another frivolous election of a person to POTUS.
IF however, a Democrat was to become POTUS in 2020, then I'd look for Michelle to be granted some POTUS Cabinet position---something to further confirm she's not cut out for high level politics, anymore than Barrack was.
Elizabeth Warren: She's NOT exactly a comfy candidate for POTUS, given her whacked flip-flopping over her alleged "native American" heritage issue, shows me she can't handle political heckling and the pressures that brings; what then can assure me she can handle the hot flashpoint moments of being U.S. President?
Andrew Cuomo vs. Bernie Sanders: Between these two guys, I'm thinking the DNC would consider Cuomo. But do remember, Sanders resigned from Democrat party; Bernie is a registered INDEPENDENT Party member.
I understand the desperate LIBERAL Democrat strategy is to put up a "Girl Power" POTUS candidate--but they got burned to put all their egg$ in one basket with Hillary; they'd be wise to AVOID putting up and fronting the frivolous female POTUS candidate.