Are you sure Warren doesn't have the same effect? Or have we accepted she's a non-starter yet?
Bloomberg seems the most likely to leach Trump's own supporters, but he'll also turn off a lot of the Socialist and Social Democrat base Bernie and Warren have. Having elected Bush, Obama and then Trump I don't see the American electorate going for a socialist candidate unless they're also white, male and a protestant. There's a reason Conservative parties like the GOP/Tories tend to be able to "stealth in" the first female/ethnic minority candidates.
Obama is really the exception that proves that rule, as whilst he adopted a Chicago-centred African-American identity he's not actually African-American so much as he's an American with an African father.
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