It wasn't so long ago that Bernienomics polled very poorly even inside the Dem base. Progress is progress even at a snail's pace!
Minimum Wage won in the ballot. Marijuana did too. Universal Healthcare or Infra or taxing the wealthy are massively popular in all polls. The proof is the pudding. You can't cite an Unscientific study without methodology, sample details & crosstabs & claim that is the truth. This is FAKE NEWS at best.
Put the details of the poll & let people say if "It was a biased sample or not", "Does it oversample certain kind of voters" "Were the questions biased/loaded/leading questions?" I can selectively take a sample or design a study tomorrow with scare mongering questions & can get a significantly different result than what actually should be.
And The Better deal is significantly borrowing from Sanders school of economics - Massive Infra to create jobs, crack down on outsourcing, 15$ Min Wage, Medicare negotiating prices, Drug importation. Yes it doesn't have every bit of Sanders policies like Universal Healthcare or Tuition Free College, but there is significant overlap in policies.