I think this difference makes sense though. Bernie has to convince his supporters that his campaign is picking up momentum, that he actually has a chance so the

I think this difference makes sense though. Bernie has to convince his supporters that his campaign is picking up momentum, that he actually has a chance so they should go out and vote. On the other hand, Hilary needs to make her supporters worried enough about the competition that they won't just assume it'll be an automatic win, and so they'll vote.