Prominent election analyst and statistician Nate Silver said former President Trump appeared to be gaining momentum ahead of the election, calling the latest data “pretty negative” for Vice President Kamala Harris in an update to his latest forecast on Sunday.

“The data for Kamala Harris continues to be quite negative,” Silver wrote on his Substack. “There are now three recent, high-quality national polls that show Donald Trump in the lead — a difficult situation for Harris given Democrats' disadvantage in the Electoral College — and her lead in our national polling average is at 1.7 points sunk. National polls don't influence the model that much, and the race remains essentially back-and-forth, but it's not hard to imagine reasons why Trump could win.

Silver was referring to a recent Fox News poll showing Trump leading Harris 50% to 48% in the presidential race, a reversal from last month when Harris held a narrow lead. The TIPP poll, also cited by Silver, shows Trump carrying Harris by a two-point margin, 49% to 47%.

FOX NEWS POLL: TRUMP TWO POINTS AHEAD OF HARRIS NATIONWIDE

Republican presidential candidate and former President Donald Trump speaks during his visit to a campaign office Friday, Oct. 18, 2024, in Hamtranck, Mich. (AP Photo/Evan Vucci) (AP Photo/Evan Vucci)

Silver's fine-grained election forecast model shows Harris still holding a slim lead nationally, with the vice president at 48.9% and Trump at 47.2% as of Sunday afternoon. But Trump, who was at 46.5% in the Silver model last Sunday, appears to be gaining ground.

“High-quality national polls show Trump in the lead, which is certainly not a good sign for Harris. A very close race though,” Silver wrote on X.

FOX NEWS POLL: TRUMP TAKES NATIONAL LEAD, HARRIS LEADS BATTLEGROUND STATES

The data guru, who revealed his plans to vote for Harris last month, expressed a similar opinion in his Sunday morning newsletter, which he titled “24 Reasons Trump Could Win.”

“Harris is the favorite to win the popular vote, but the Electoral College bias favors Republicans by two percentage points. “At a time of intense partisanship and close elections, this is inherently difficult for Democrats to overcome,” he listed as number one.

Democratic presidential candidate U.S. Vice President Kamala Harris speaks about the assassination of Hamas leader Yahya Sinwar during a press statement at the University of Wisconsin – Milwaukee in Milwaukee, Wisconsin, October 17, 2024. (Photo by SAUL LOEB / AFP) (Photo by SAUL LOEB/AFP via Getty Images) (SAUL LOEB/AFP via Getty Images)

Other explanations on his list include inflation, higher prices under the Biden administration, immigration, declining trust in the media and Harris' political record.

POLL GURU NATE SILVER REVEALS HE VOTES FOR KAMALA HARRIS

“The cultural mood is shifting to the right and the left continues to pay a price for the excesses of 2020 on COVID, crime, wokeness and other issues,” he says, citing another possible factor.

Silver continued: “Harris ran far left in 2019, took many unpopular positions, and doesn't really have a viable strategy to explain her changing positions.”

“Harris got carried away and failed to articulate a clear vision for the country. It might have been a good strategy if the “fundamentals” favored them, but they don’t.”

Political analyst Mark Halperin says both Trump fans and Democratic voters who study poll data have told him that Republican presidential nominee, former U.S. President Donald Trump's chances of winning the presidency are increasing. (Photo by Michael Ciaglo/Getty Images)

The latest Fox News poll shows Harris with a 6-point lead among voters from the seven key battleground states (within the margin of error for this subsample), and the candidates with voters in closely spaced districts (where Biden- Trump is the majority of voters) each has 49%. The margin in 2020 was less than 10 points. Trump's advantage comes from a larger share of counties he won by more than 10 points in 2020 (64%-35%) than Harris had in counties Biden won by more than 10 points (58%-39). %).

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That raises the question of whether Democrats could win the Electoral College while losing the national popular vote. In 2000 and 2016, it was the Republican candidate who lost the popular vote but won the Electoral College.

Fox News' Dana Blanton contributed to this report.