Clinton campaign: We lost because of the Comey letter

[peterthlee]

No.
In the run-up of the election day, the so-called quality pollsters (like Quinnipiac, Monmouth, etc) showed a comeback for Clinton at around 3-6 pts.
This could be a factor, but not an important one.
The main reason is increased white turnout in rural states + dissatisfaction among grassroots with Obama's policies + shy Trump effect in polls (so Clinton would overestimate herself's chances to win) + decreased black turnout as Obama was no longer on the ballots + some swing state people would eye for a drastic change of the republic's direction.
In addition, Clinton was not as 'high-energy' as Obama and Trump from what I've seen in the campaign photos.
It is unfair to point the sole finger to Comey, though he did damage Clinton's campaign by a little.