I will say again, as I did over and over during the Romney disaster in 2012, that “winning” with 28% or 30% of the vote makes no sense at all if 72% of the voters really, really don’t want you.
It’s one thing in a final election to choose someone for a job, if there are multiple candidates (although runoffs are much better).
But in a preference poll? To choose a candidate who can win a two-man election?
It can only work in the presence of party loyalty so strong that all, or most, of the 70% who voted AGAINST candidate X are certain to vote for him in November.
Such party loyalty no longer exists in the US, and hasn’t for years.
They say that 10% of the Bernie Bros voted for Trump because they were so disgusted LAST time. I can imagine that will be a LOT higher this time. I do believe right now Bernie HAS his support. The 70% that don’t support him aren’t going to. Intelligent people will recognize the Rats can’t win without Wall Street cash and Bernie will get none.