I had promised Bernie when I took the helm of the Democratic National Committee after the convention that I would get to the bottom of whether Hillary Clinton's team had rigged the nomination process, as a cache of emails stolen by Russian hackers and posted online had suggested. I'd had my suspicions from the moment I walked in the door of the DNC a month or so earlier, based on the leaked emails. But who knew if some of them might have been forged? I needed to have solid proof, and so did Bernie.