If they lose the mid terms, their own radicals
will line them against the wall.
they would absolutely lose their minds if they lose again - maybe many of them would then abandon the party and go to the Greens and make the Left’s movement be fractured and weakened for many years to come.
This is not the Democrat party of Tip O’Neill. Heck, it isn’t even the Democrat party of Dick Gephardt...not even he could make it among today’s Dem base.