Emerson National: Biden 26, Sanders 26, Harris 12, O’Rourke 11, Warren 8

[Mr. Morden]

GOP #s:

Trump 90%
Weld 10%

[Mr. Morden]

Clinton 2016 primary supporters:
Biden 34%
Sanders 14%
O’Rourke 13%
Harris 12%
Warren 9%

Sanders 2016 primary supporters:
Sanders 42%
Biden 17%
Harris 11%
Warren 11%
O’Rourke 9%

Voters under age 30:
Sanders 42%
Biden 20%
O’Rourke 11%
Harris 6%

Voters over age 65:
Biden 33%
Harris 17%
O’Rourke 14%
Sanders 13%

Midwest:
Sanders 32%
Biden 29%
Harris 13%
Buttigieg 6%

Northeast:
Biden 28%
Sanders 18%
Warren 12%
O’Rourke 10%

South:
Biden 23%
O’Rourke 19%
Sanders 19%
Harris 11%

West:
Sanders 37%
Biden 27%
Harris 13%
Warren 6

On the GOP side, Weld supporters skew male and young.  He wins 13% of men, but just 6% of women.  And 17% of those under 30, but just 7% of those over 65.  Also, there were 34 Hispanics in this poll who said they’ll vote in the GOP primary.  18 of them back Weld, compared to 16 for Trump. 

[Mr. Morden]

i would’ve expected bernie to have a higher retention rate, it’s not much higher than the % of clinton-biden supporters

Well, it's just one poll.  I think other polls have had his retention rate a bit higher.  But it can't be *that* much higher.  If he's in the 20s in polls for 2020, then of course his retention rate from 2016 can't be higher than about 50%.  Especially since he polls so well among youngs, he's inevitably going to also be pulling strong #s from those who weren't old enough to vote last time (though, yeah, that's a very small slice of the electorate).