This is the sort of thing that can become a campaign killer and knowing Joe Biden, there will be plenty of gaffes to come. I especially don’t understand the skepticism toward Warren in light of Biden’s spotty background. I also maintain that any democrat is perfectly capable of beating Trump, but Biden is easily the riskiest. For many reasons, not the least of which being that after two years of hammering Trump on race relations Dems can’t run someone like Biden.
Another thing about Biden I haven’t mentioned is that he is politically toxic. I don’t think he will have a problem beating Trump, but the midterm following will be critical for democrats and the people that gave Dems victories in 2018 aren’t going to show up under a Biden presidency. I don’t see them winning the senate in 2020 either with Biden at the top of the ticket.
He will also embolden the GOP after four years of bending over for them and will probably have a primary challenger. He is honestly an even worse candidate than Hillary.