… “What we’re saying is, it is absurd to my mind that Clinton has 400 superdelegate votes before the first ballot is cast and that we have to compete in a situation in which we’re up against closed primaries where a significant part of the population can’t vote.”
On the other hand, Sanders believes that Clinton's establishment ties will continue to hurt her moving into a general election.
“The American people are sick and tired of establishment politics. That’s what it is. Do people really agree with Donald Trump’s absurd views? No. ... And he’s a phony, of course... they perceive him to be ... ‘anti-establishment.' And anybody who is anti-establishment is better than the establishment... Hillary Clinton is the establishment," Sanders pointed out…
(quoted from Young Turks interview -
https://www.youtube.com/watch?v=V-_6IoxmfzU )