No, he isn't, handicaps. This is the dumbest right-wing narrative yet.
"Bernie Sanders should've split the Liberal demographic in half between a candidate he despises and a candidate he agrees with on 95% of issues!"
this is essentially why i'm not mad at him for endorsing hillary
it was either going to be endorsing her and giving many of his followers to someone he is ideologically close to (despite her immorality)
or not endorsing her and perhaps a lot of his followers going to Annoying Orange, who is equally immoral but also ideologically opposite
he's not stupid, he understands the 2-party system and he didn't want Annoying Orange to win
and he's not making a big deal of the rigging because then he's fueling the fire that Annoying Orange is taking advantage of