Primaries are controlled by the parties. If they see a candidate they really don't like *COUGH*Bernie*COUGH*Sanders*COUGH* then they'll pull out all the stops to prevent that candidate from winning. People like to think Trump wasn't wanted by the republican party, but his policies aligned 100% with theirs. Similarly, "hope and change" Obama was allowed to win because he was willing to play ball and went back on most or all of his promises immediately after getting elected.
Good thing (for genocide Joe’s ego) the DNC is refusing to hold primaries at all then.
The solution to this is so simple - Biden gets out of the way for literally any other Dem to run and sweep the election. The entrenched power structure won’t have it though.
So, don’t blame Muslim Americans, progressives, or anyone else for Biden’s failure to lead. This is on him and the DNC who backs him.