I find really strange that there are, at least according to this poll, so many people who would vote Biden (in a Trump/Biden matchup) but who would vote Trump when he is paired against another democrat, I mean you either like Trump or you hate him, there is no middle ground with him.
I don't think it's at all strange. There are certainly some on the right who don't like Trump for various reasons, but would vote for him to "save the country from being led into Socialism" by someone like Sanders or Warren. Biden isn't perceived as the same threat, so those people are open to voting for him.
I can confirm that I’d vote Biden and probably Buttigieg but would probably vote Trump over the others. It mostly comes down to agreeing more with Democrats (and thinking Trump is awful), but I also work and make pretty good money in the healthcare industry, and M4A would probably put myself and a lot of other people completely out of work. So that’s just not something I’m going to mess with, even if I generally like Sanders and Warren as people.
So ya I think this poll is very reasonable and probably is best for Buttigieg if you’re reading deeply into it - he is primarily behind Biden because of name rec still, particularly among minority voters. In a GE I’ll bet that he would outperform Biden, but Biden will still do fine.
I would vote for Biden or Mayor Pete in a heartbeat, but I'd be super hesitant to vote for either Bernie or Warren (even though I like them as people).