As far as primarying the two duds from Delaware, Carper and Coons, that’s been done. Problem is the challengers were even further Left than those two are. As far as Republican challengers , they have a steep climb in a state with a 22% black population.
The people calling on Coons and Carper to be primaried for their votes on the minimum-wage bill are doing so because they think that they aren’t Leftist enough, so they’d probably like the Leftists that ran against Coons and Carper last time.