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."