It is pretty clear that Sanders-Warren wing will decide the nominee & Booker-Cuomo etc have no chance & stature.
As much as I can't stand Cuomo, I don't think that's clear at all. Out of everyone on the list, those are probably the 2 with the lowest name recognition. People don't usually say they'll vote for someone if they don't know who they are or what they stand for. That's probably also partly why Winfrey and Cuban are so low. People are like... "okay but why are they running?" They'll have to answer that question if they actually do. Actually, I think the worst performers here are Sanders and Clinton. With the name recognition and campaigns they just ran, their numbers are pretty poor with a lot of people knowing who they are and what they stand for but saying they'd rather vote for a random nobody instead.
Though I'm skeptical of polls this far out anyway. This is kind of a joke list to me, and I would have picked "none of the above" if they asked me.