And the poll you're likely referring to[2] shows him with a double-digit lead. Now, I'd hope it'd be pretty obvious what kind of bias MSNBC has by running a poll that asks questions such that you get a result like:
> while also finding that the most unpopular candidate qualities in a general election are being a socialist, being older than 75 years of age and having a heart attack in the past year
Oh gee, I wonder what possible candidate they might be referring to (in an article which is titled "Sanders opens double digit national lead"). I don't know what the question in the poll was, but it should be fairly obvious how easily you could phrase the question to come up with that result.
If Bernie is so unpopular, why is he the only candidate (of any political party) in American history to win the popular vote in the first three primary states?
[1]: https://thehill.com/policy/healthcare/403248-poll-seventy-pe... [2]: https://www.nbcnews.com/politics/meet-the-press/nbc-news-wsj...