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This supporter then relayed what had happened to Mr. Buttigieg’s campaign, which contacted J. Ann Selzer, a respected Iowa-based pollster whose company conducts the poll, about it. But the Buttigieg aide, who requested anonymity to discuss a private conversation, said the pollster offered little information about how many surveys the one-time Iowa front-runner was left off.

Carol Hunter, the executive editor of The Des Moines Register, said the newspaper could not confirm “with certainty” that the polling irregularities were limited to one respondent.

“It is imperative whenever an Iowa Poll is released that there is confidence that the data accurately reflects Iowans’ opinions,” she wrote, in a statement on the paper’s website.

Iowans typically finalize their choice late in the campaign, often deciding in the days before the caucuses occur. The late-breaking nature of the state’s political culture lends the poll outsized influence, with the power to fuel a last-minute surge in the state or can be an early dirge for candidates struggling.

Ms. Selzer called the cancellation “heart-wrenching.”

“Because of the stellar reputation of the poll, and the wish to always be thought of that way, the heart-wrenching decision was made not to release the poll,” she said in a statement on Saturday night. “The decision was made with the highest integrity in mind.”

Recent surveys have shown a fluid race, with Senator Bernie Sanders gaining momentum as other leading candidates trail close behind.

The poll was scheduled to be released as the leading candidates were making the final push toward Monday’s caucuses, the beginning of the nominating process to select the Democratic nominee. Candidates crisscrossed the state Saturday, several of them targeting Mr. Sanders, who was leading in the last Register poll several weeks ago and also recently topped a New York Times/Siena College poll last week.