Hillary Clinton

This article spells it out, of course, but when the only things the Sanders campaign ever complains about are the situations that didn't go their way, it couldn't be more obvious.

Similarly, the "let everyone vote to bring more Dems into the party" approach never made the least bit of sense. If you don't require people to change party affiliation to vote in your own primary, they have no motivation to change parties. That argument always made the point opposite of the one it was apparently intended to make.