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The responsibility that superdelegates have is to decide what is best for this country and what is best for the Democratic Party, Sanders said on May 1, 2016. And if those superdelegates conclude that Bernie Sanders is the best candidate, the strongest candidate to defeat Trump and anybody else, yes, I would very much welcome their support.
Later that month, Sanders told CNN, I am not a great fan of superdelegates, but their job is to take an objective look at reality. And I think the reality is that we are the stronger candidate.
On May 29, 2016, Sanders said superdelegates had the very grave responsibility to make sure that Trump [is not] elected president of the United States. Vote for the strongest candidate.
And even as Clinton secured the Democratic nomination the following week, Sanders continued to push for superdelegates to vote to override Clintons pledged delegate majority.
Told on June 7, 2016, that his superdelegate convention push would defy history and the will of the voters, Sanders said, Defying history is what this campaign has been about.
Taken from:
https://www.washingtonpost.com/politics/2020/02/20/bernie-sanders-pushed-contested-convention-2016-now-he-wants-avoid-one/
Despite badly lagging in the delegate count, Bernie Sanders' campaign manager told NPR the campaign believes Sanders can and will be the Democratic nominee by winning over superdelegates at the 11th hour.
It's a sharp contrast from earlier in the campaign when Sanders supporters called superdelegates "undemocratic" and petitioned for them to support the candidate who has the most votes by the Democratic convention this July.
"When they get to the convention," Weaver continued, "nobody has the delegates to win with pledged delegates. It's going to be the superdelegates who are going to have to decide this."
"Now we can argue about the merits of having superdelegates," Weaver continued, "but we do have them. And if their role is just to rubber-stamp the pledged-delegate count then they really aren't needed. They're supposed to exercise independent judgment about who they think can lead the party forward to victory."
Weaver added that superdelegates don't vote until they actually go to the convention, and he considers their allegiances as movable as poll numbers.
If by the convention Sanders has "substantial momentum" and has substantially "closed the gap" in pledged delegates, Weaver said, "I think there's a strong argument to be made to superdelegates that they should take another look."
Taken from:
https://www.npr.org/2016/05/19/478705022/sanders-campaign-now-says-superdelegates-are-key-to-winning-nomination