This dude lives in fukking hollywood
the rest of us don't have democrats in safe seats
There hasn't been any polling showing that Sanders being the nominee would put the HR majority at risk.You'd be better off making that type of argument about reclaiming the Senate.
However...
Hickenlooper and Kelly should both outrun everyone vying for the nomination in their states.
Sanders is well liked in NE region and Gideon is a great candidate in ME. Collins is also tied to Kavanaugh and has taken other MAGA votes which should help sink her.
The most recent poll I saw had him beating Dummy in NC (too early for general H2H tbh) so he and Cooper should help Cunningham/Smith beat Tillis and other down ballot races there.
Everyone knew Jones was living on borrowed time. Both GA races, IA, and TX were always longshots. Success in KS is largely dependent on Kobach being the GOP nominee and it's still KS.
In short, find a better angle.