I think Sanders was put up as the “Moonbat Candidate” to make Hillary look “centrist” and acceptable. Sanders willingly went along with the charade...until much to his own surprise, he found out that “Moonbat” was exactly what the core of the democrat party and the media propaganda complex actually wants.
And now Hillary has to out-Moonbat him.
She has to out moonbat him during primaries, then move to center on the election.
Of course “center” for her would be slightly more moderate than Fidel Castro.