Comey cost Clinton the election and she would have won 307 electoral votes without him. Those who argue otherwise are ignorant or wilfully blind to the data both at the time and afterwards that proves this. Comey had a major measurable effect in decreasing Clinton's lead and flipping undecideds to Trump.
This is spot-on. Comey's ill-advised 10.28.2016 announcement was the main culprit for Hillary's loss and the Senate (and by extension, the Supreme Court) staying in GOP hands. There were also other reasons as to consider why she lost: The Obamacare premium hikes announcement just a few days before that, Russian interference, engulfing anti-Clinton sentiments, and poor campaign strategy (esp. ignoring Wisconsin).
