Looking at the MI and MO primary results, it appears that a large chunk of Bernie’s support was more anti-Hillary than pro-Bernie, particularly among white males.
https://twitter.com/ryanstruyk/status/1237570631761182720The voter turnout was relatively high, and Biden won every county in MI, MO and MS. That’s impressive, especially in MI.
One big problem for Bernie is that the percentage of young voters is almost the same or less than four years ago. It didn't grow as it needed to. Compared to 2016, Sanders also got less percent of the African American vote in MS, MO and MI this cycle. African Americans are the most loyal voters of the Democratic party. No one after 1988 has won the nomination without winning that key voting group.
I think many D voters and independents just want Trump gone (“Trump exhaustion”) and that makes everyone more risk averse. Biden is not a polarizing figure and that makes him acceptable to even those who would prefer a different candidate. People want stability, security and sanity, and that's what he represents. Not exactly a recipe for revolution.
I do appreciate what Bernie has brought to the table. He's been successful in helping to frame much of the discussion in the D party (e.g., livable wage, affordable health care and zero carbon energy). What he’s accomplished is significant.