Oh, I thought the question said who they are going to nominate in 2020. Sorry. If we're talking about a "progressive champion", probably Harris or still Sanders, even though he won't win the nomination. I don't see Warren going anywhere.
Well I still highly doubt that Sanders will run. He's more likely to play the role of king maker, not king.
The real question is who he decides to throw his support behind come 2020. I could definitely see him passing the torch to Harris if she decides to work with him on progressive causes in the Senate. However, I'm not entirely sure she'll do this. Democrats are already beginning to turn away from Bernie Sanders and towards Obama to lead the party. Which is understandable to a degree, Bernie is still a registered Independent, but that might be the wrong move.
Obama has already stated that he wants to groom a new bench of Democratic leaders, and Harris seems like a likely recipient of that treatment. Not that that's a bad thing, but I'm starting to wonder if Obama has lost his edge.
Gabbard represents the far-right, not any sort of "left."
Red avatars are constantly pushing this narrative on this forum, and I can't understand why. She's a bit libertarian when it comes to foreign policy; that's it.