it is a fact
Sam Wang's polls showed that Clinton's margin over trump fell dramatically after the Comey letter, and never recovered. Nate Silver noted that the Comey letter coincided with a 3 point swing against her, and these public polls were supported by the internal polling from both campaigns showing that it was a massive blow to Clinton at a pivotal moment in the election.
"The Evidence is Overwhelming: James Comey Decided Who Our Next President Would Be--Mother Jones
Over at Vox today, a trio of researchers takes a broad look at the evidence that FBI Director James Comey affected the election. Their conclusion:
The evidence is clear, and consistent, regarding the Comey effect. The timing of the shift both at the state and national levels lines up very neatly with the publication of the letter, as does the predominance of the story in the media coverage from the final week of the campaign. With an unusually large number of undecided voters late in the campaign, the letter hugely increased the salience of what was the defining critique of Clinton during the campaign at its most critical moment.
The appeal of big-picture narratives about demographics, along with anecdotal evidence of big mistakes by the Clinton campaign in certain key states, makes it easy to point fingers. But looking specifically at the three “Rustbelt” blue states mentioned at the beginning of the article, no unifying picture emerges. Most stories mention Michigan, where Clinton didn’t campaign, rather than Pennsylvania, where she campaigned intensely. Indeed, these three Midwestern states (Wisconsin being the third) provide essentially an A/B/C test of different campaign strategies — and in each state she came up just short.
If it weren't for Comey, Hillary Clinton would have won the popular vote by about 6 points and the Electoral College by 70 or more. And that might have turned into control of the Senate as well, though that's a little more speculative."
http://m.motherjones.com/kevin-drum/2017/01/james-comey-decided-who-our-next-president-would-be
The premise of the OP is anecdotal which is meaningless
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