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"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."
Weaver also argued that because Sanders has won several late primary states, he would have momentum going into the convention. In 2008, Obama lost nine of the last 12 contests, but still left the primary season with a pledged delegate lead over Clinton.
Sanders Campaign Now Embraces Superdelegates As Key To Nomination
In a sharp contrast to earlier in the campaign, the Sanders team now hopes superdelegates will see him as the better Democratic candidate and support him ahead of the convention.
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I would certainly agree that Weaver's plan did not work.