the results are not as extreme in minnesota as they are in massachusetts. you would expect at least some klobuchar supporters in minnesota to move to warren, and she did get a minor bounce. sanders also appears to have gotten a minor bounce.
but, you still have to accept that klobuchar convinced almost all of her voters to vote for biden, who had been polling in single digits here since he announced.
i could run through all of the same arguments, with the caveat that they're all a little weaker - it's 80% rather than 90%, and still very hard to believe, if that little bit less hard to believe. but i won't. i made my case and it's transferable....