Sanders did have the support of more caucus-goers, both on the first and final alignments. But because of the caucus rules, he will receive slightly fewer delegates.

The announcement came after a review by the party of precincts with apparent mistakes in their results. Of the 95 instances flagged by campaigns, the state party said, 55 had small changes, 36 precincts matched what was reported by precinct leaders on caucus night and four were duplicates.

The announcement brings the end to the dysfunctional and disastrous caucus much closer. Candidates have until noon Central on Monday to request either a full recanvass or recount. Sanders team said Sunday that they will at least request a recanvass.

“We will request a recanvass of specified precincts,” said Jeff Weaver, Sanders' senior adviser. “This was an informal review for clerical errors,” he said, referring to the IDP review.

Weaver said the math in a number of the precincts was "wrong," and that the Sanders campaign is also considering requesting a recount.

The Associated Press declined to call the race, following the updated results released on Sunday evening, citing the close margin and still some outstanding apparent inconsistencies in results.

“There is still some evidence the party may not have accurately tabulated some of its results, including those released late Sunday following a series of revisions,” an alert from the wire service read.

A major point of contention is that the Iowa Democratic Party maintains that it cannot correct errors on precinct math worksheets, even if there are apparent mistakes on them.

“It is the legal voting record of the caucus, like a ballot,” Shayla McCormally, a lawyer for the state party, wrote in a memo sent by state party chair Troy Price to party officials that was obtained by The New York Times. “The seriousness of the record is made clear by the language at the bottom stating that any misrepresentation of the information is a crime. Therefore, any changes or tampering with the sheet could result in a claim of election interference or misconduct.” The memo continued that the only way to challenge worksheets is for a campaign to seek a recount, a much more intensive process than a recanvass, according to The Times.

Price made a similar argument in a press conference on Friday, as did party officials in a background call with reporters on Sunday.

Holly Otterbein reported from Durham, N.H.