I learned to forget all about U.S opinion polls, as they are notoriously innacurate, due to various factors like non compulsory voting, the electoral college and the tens of millions still living in small towns and rural areas being generally under represented in these polls due to the extra expenses needed to reach them.
Be mindful that David Brookes is very much a conservative. I read the piece. It does cover a area where Sanders is vulnerable. A nuanced understanding of Sanders previous comments does placate progressives but in a general election it very well could be a problem.Both the NYT and Washington Post have hailed the South Carolina result as the possible saviour of the Democratic Party, with the black vote in particular delivering overwhelmingly for Biden -
The NYT claiming Sanders is the Democratic Party version of Trump, or even worse -