Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE would likely have been elected to the White House if not for FBI Director James Comey's October letter to Congress regarding the investigation into her private email server, statistician Nate Silver tweeted Sunday.

"Comey had a large, measurable impact on the race. Harder to say with Russia/Wikileaks because it was drip-drip-drip," Silver said in the first of a series of tweets about Comey's possible influence in the election.

Comey had a large, measurable impact on the race. Harder to say with Russia/Wikileaks because it was drip-drip-drip. https://t.co/LgJkfYpZCk https://t.co/9FYMNz763b — Nate Silver (@NateSilver538) December 11, 2016

Silver tweeted a graph showing that late-deciding voters in several swing states, including Michigan, Wisconsin and Pennsylvania, did not go for Hillary Clinton.

There's more evidence, too: Late-deciding voters broke strongly against Clinton in swing states, enough to cost her MI/WI/PA. pic.twitter.com/8r801ahDQO — Nate Silver (@NateSilver538) December 11, 2016

"I'll put it like this: Clinton would almost certainly be President-elect if the election had been held on Oct. 27 (day before Comey letter)," Silver tweeted.

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Comey in October sent a letter to lawmakers about the discovery of new emails the FBI said were potentially relevant to the investigation into Clinton's use of a private email server while serving as secretary of State.

The emails were reportedly found during a separate FBI investigation into former Rep. Anthony Weiner (D-N.Y.). Weiner is the estranged husband of one of Clinton's top aides, Huma Abedin.

Republicans and members of Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's campaign seized on the new information, attempting to cast Clinton as corrupt and praising the FBI for the development.

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Then just days before the general election, Comey announced the FBI had not changed its July conclusion not to bring charges regarding Clinton's private server.

Since the election, Clinton campaign officials have put blame on Comey for the Democratic nominee's loss.

"There are lots of reasons why an election like this is not successful," Clinton told donors on a conference call one week after the election. "Our analysis is that Comey's letter raising doubts that were groundless, baseless, proven to be, stopped our momentum."