Radical Leftist Truthout only published what the Leftist magazine
The Economist published. Their poll here:
https://docs.cdn.yougov.com/jf179lebaq/econTabReport (2).pdf
Run in conjunction with the Leftist group YouGov,
https://today.yougov.com/
actually ran the poll. It's interesting to note that nowhere in any of that do the pollsters give but the most basic details of their sample (1500 total, 1315 registered voters, +/- 3% margin of error).
You can get a feel for YouGov's intrinsic bias from this page on their site:
https://today.yougov.com/ratings/politics/popularity/politicians/all
It's a who's who of Progressive Leftist Democrats.
Then there's the fact that
The Economist and YouGov are British institutions in the UK...
So, take that poll with a salt mine worth of salt...