The Clinton campaign vastly underestimated Bernie Sanders. They thought he would provide only token opposition to Hillary’s coronation. She had hundreds of “super delegates” pledged to her before the primaries even began. When it became apparent that Sanders was raising more money than her, the DNC changed the fundraising rules to enable Hillary to bring in more cash. Donna Brazille provided her with debate questions in advance. Despite all this, Bernie Sanders ran a much more competitive campaign than they ever expected, and damn near took the nomination away from her. Now it’s “Bernie’s fault” (among many others) because she lost the election.
It takes a special kind of loser to complain about the results of a primary campaign that were rigged in your favor. LOL.