Bernie should endorse Elizabeth Warren as President, and Warren should immediately commit to Sanders as her Vice President.
By accepting the Vice Presidency and anointing Warren as President despite his current lead in the polls, Bernie would instantly become one of world history’s greatest leaders (and greatest male feminist) without sacrificing any aspect of his policy agenda.
It would heal the fissure currently rending the progressive wing of the party and in all likelihood draw the party dramatically leftward as well.
Also, Senate tie-break.
We all know she’d be good at the day to day job.