Now that Beto is in and Biden has effectively leaked his decision, I think polls are starting to have some meaning. Here is a brand new one from CNN/SSRS of Democrats/leaners who plan to vote in the Dem primaries/caucuses:
Biden 28%
Sanders 20%
Harris 12%
O’Rourke 11%
Warren 6%
Kerry 4%
Booker 3%
Klobuchar 3%
Buttigieg 1%
Castro 1%
Gillibrand 1%
Hickenlooper 1%
Inslee 1%
Delaney *
Gabbard *
McAuliffe *
Bullock *
I also found this question pretty revealing... it may indicate that even though Sanders has a lot of support right now, it could be hard for him to build a coalition of 50% of Democratic voters:
Democrats' Chances in 2020 Are Better...
With Bernie Sanders 33%
Without Bernie Sanders 56%
Same question with Uncle Joe does not yield the same results:
Democrats' Chances in 2020 Are Better...
With Joe Biden 51%
Without Joe Biden 36%
-Jason "Kerry?? Why are we even asking about him? He ain't running" Evans