Whoever jumps in pretty much needs to be a person who everyone thinks can win but can suck up the progressive support from Sanders if he drops out. Literally Warren fits this mold perfectly but won't do it because she doesn't want it. But if a relatively young, charismatic woman with a progressive reputation jumped in, I don't see Hilary winning.
I think Kirsten Gillibrand fits that role perfectly.
Gillibrand is not particularly progressive. Although her views are basically generic Democrat (like Hillary's), she's also built a large part of her career around being a moderate. Not well positioned to take Hillary on front the left at all.
I was looking at the list of current Senators and two popped into fore as the best possible candidates in this situation. One is Gilibrand, but I'm not sure how she'd really be perceived. The other, and I actually think this would be a hell of a choice on various levels, would be Tammy Baldwin.
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