Clinton yesterday told fundraisers and donors in a conference call that Comey's two letters to Congress on the probe had tilted crucial states towards Republican Donald Trump, US media including Quartz and CNN reported.
"There are lots of reasons why an election like this is not successful," Democrat Clinton told her national finance committee, a person on the call told online magazine Quartz.
"But our analysis is that Jim Comey's letter raising doubts that were groundless (and) baseless -- and proven to be -- stopped our momentum."
His second letter, on November 6, just three days before the election, stated that the FBI's review of the new emails had uncovered no wrongdoing, and that the bureau had not changed its July recommendation not to charge Clinton.
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While the first letter reopened old wounds and reminded voters of the controversy, the second letter, according to Clinton, had the perverse effect of energizing rival Donald Trump's base, Quartz reported.
"After the third debate we felt so good about where we were," Clinton said, according to Quartz's source, who chose to remain anonymous. The campaign analysis "showed that we were up in all but two of the battleground states, where we were tied or one point behind. In Arizona we were even. We felt real wind at our back."
But she said the FBI's last-minute role was too much to "overcome," a donor on the call told CNN.
Comey however slammed the practice as "extremely careless."
The FBI chief came under fierce criticism for effectively reopening the Clinton probe so close to the November 8 vote, without knowing whether the new emails were relevant.
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