They have helped. They have preserved the "inevitability" of Hillary's nomination in the minds of many Democrats. Sanders would have had a stronger case had the delegate count been closer.
In terms of Hillary's vote totals and lack of electoral challenges, OBVIOUSLY this.
It's astounding that this option is losing 25-75%/a testament to how warped perception is around here.
Most nobody knows the difference between a delegate and a superdelegate, and if the supers hurt hillary reputationally, it's among sanders diehards or after the fact.
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