Sanders raises all kinds of interesting populist issues in his speeches,
but he is seeking the nomination of a party that is the proven enemy of
the working class and he has promised, citing the lesser-evil doctrine,
that he will endorse the Democratic nominee whoever it happens to be.
So we can see that progressives like Kaufman and Sanders are not really
opposed to standing on principle. It’s just that they have replaced the
principles of working class solidarity and telling the truth with the
“principle” of lesser-evil politics. This approach has persisted for
decades while the labor movement has suffered blow after blow. Borrowing
from Sara[h] Palin we have to ask, “How’s that lesser-evily thing working
for ya?”
-- Bruce Lesnick, "Sanders and Lesser-Evilism: Is There No Line You Will Not Cross?" (CounterPunch).