The slowdown was exacerbated by the fact that the party was for the first time attempting to report three different sets of data, an initial headcount of each candidates' support, a count after supporters had realigned, and the state delegate winners.
Iowa Democratic Party officials hunkered down Monday night in their war room, initially leaving campaigns in the dark over the delay in the reporting of caucus results. But it may be a while before we find out what they were.
Helen Grunewald, a precinct caucus chairwoman in Benton County, said she had been on hold with the party trying to report her results for a significant amount of time.
Central (0530GMT), official tabulations on the Iowa Democratic Party's website had 0 of 1765 state precincts reporting in.
The delay means that Democratic presidential hopefuls, who dedicated huge amounts of time and money to winning over voters in Iowa, are now moving on to New Hampshire (which holds its primary vote next week) without a clear sense of who can claim victory in the first contest.
Precinct chairmen found it hard to use the app to report results to party headquarters and instead resorted to calling a hotline. Eventually, Iowa's 41 pledged delegates (out of 4,750 total delegates at the Democratic National Convention) are allotted to the "viable" candidates who remain. The state Democratic party leadership and campaigns are hoping for much higher numbers this time around, especially because the nation is deeply divided along party lines and opinions of the current president.
Schultz also said he's not concerned about the differences between moderates and progressives but will be concerned if the Democratic Party "doesn't work together".
With no results as the calendar turned to Tuesday, candidates were left with little else to do but go before their cheering supporters and portray a sense of optimism amid the uncertainty.
It was a night of American democracy in action, with voters spending the better part of a winter evening clustering in groups of supporters for Sanders, Biden, Klobuchar, Sen. And beyond 2020, critics began wondering aloud whether Iowa's decadeslong tradition of hosting the first presidential primary election was in jeopardy.
Sanders led among younger voters, those under age 45, while Biden was the choice for older voters.
"A lot of us are going to be doing it on paper and calling it in", said Kelcey Brackett, the chairman of the Muscatine County Democratic Party.
"This is simply a reporting issue", said McClure. Bernie Sanders addresses supporters during his caucus night watch party on Monday in Des Moines, Iowa. The process occurs in person at various types of locations, including gyms, church basements and libraries.
Trump campaign manager Brad Parscale floated an unsupported conspiracy theory.
In recent years, the victor in Iowa has also ended up becoming the Democratic nominee.
The final candidate will be chosen later this year to run against presumed Republican candidate President Donald Trump.