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Pete Buttigieg hit the Hamptons over the weekend, and insiders said that the fundraising spree moved the Democrat farther ahead of the pack in one small, but influential, poll.

Sales of candidate tchotchkes — from cocktail napkins to plastic cocktail tumblers — at East Hampton souvenir store the Monogram Shop have been known for predicting the outcomes of nearly every primary and general election since 2004. And sources said that area events backing Buttigieg further tipped the scale in his favor.

Observed a Hamptons operator who attended a “Cocktails & Conversation with Mayor Pete” fundraiser on Aug. 31: “The Monogram Shop has a poll they claim is very accurate — they sell cups during the election. People see it as reliable, and everyone at this party had Pete 2020 plastic cocktail cups. He’s booming in the poll at the Monogram Shop.”

Another source said that the shop sold out of Buttigieg cups with fans having to come back for more.

Either way, Buttigieg himself was not completely sold.

“I’m not familiar with the Monogram Shop poll,” Buttigieg was overheard admitting to his influential Hamptons supporters at the event. “I’m not sure how accurate it is compared to the national polls,” he said, a source told us.

“It’s more accurate,” the crowd assured him. Spotted at the event at the home of Robert Marc and Gunnar Spaulding were fashion maven Fern Mallis and former six-term congresswoman Jane Harmon, as well as co-hosts Mario Palumbo and Stefan Gargiulo.

The Monogram Shop posts its candidate cup sales daily. Earlier this month Buttigieg was already leading all 2020 presidential contenders, with Donald Trump as No. 2.

Kamala Harris was also campaigning in the Hamptons in August, as was Trump.

The Monogram Shop’s poll was wrong once, in 2016.

We hear that Buttigieg and his husband Chasten stayed at the Hamptons home of Broadway power player and fashion world favorite Jordan Roth and husband Richie Jackson.

Roth, the head of Jujamcyn Theaters, posted a pic of the couples on Instagram, captioned: “Our houseguests this weekend are on their way to the White House! Sitting around our table with [the Buttigiegs] I felt a calm and hope and joy and possibility I haven’t felt for our country in years.”

Roth and Jackson hosted Buttigieg’s first big NYC fundraiser at their Manhattan home back in April.

Buttigieg also attended a Hamptons fundraiser hosted by another Broadway bigwig, the producer of “Hamilton” Jeffrey Seller at his Sagaponack home. Another was at the home of Insight Partners managing director Deven Parekh.

The Monogram Shop did not answer on Labor Day when Page Six called.