Biden Was Always A Bad Candidate
I was honestly surprised to see Biden come in so weak in Iowa and New Hampshire. But maybe I shouldn't have been. As Jonathan Chait points out, in three Presidential runs Biden has never finished higher than fourth in any primary or caucus.
(It is a bit of schadenfreude to see people like Chait -- a pro-war, pro-charter school Democrat who supported Trump's nomination in 2016 on the "he'll be easy to beat" theory -- discomfited by Biden's crash and Sanders's rise.)