Well, I'm sure this had an effect on the race and you could probably say it made the difference in raw votes, but the question is: did it make a difference in raw votes in the places that mattered? If you go the path of least resistance, then we lost because 60,000 Obama 2012 voters in PA/WI/MI flipped to Trump. I'm not sure based on where and who we lost that the Comey letter caused that. If anything, it shrank our margins and nerfed support in many suburban areas among GOP leaners, but it probably wasn't enough to matter in those states (maybe in PA).
And of course Trump could blame the pussy tape for losing NH. Those angry women wouldn't have come through for Hillary otherwise.
