Transcript for Buttigieg, Sanders neck-and-neck after Iowa caucus
Good evening and it's great to have you with us here on a Tuesday night. And we are here in Washington tonight. President trump delivers his state of the union address just a short time from now. But much of this day was spent focused on the chaos in Iowa. A catastrophic failure. A new computer app crashing, the manual count that followed. And now a full day later, the first results just in tonight. They are partial results, but they do show what looks to be a big night for mayor Pete buttigieg. He and Bernie Sanders fighting for the top spot. With 62% of the precincts reporting, buttigieg at 27%, Sanders at 25%. The candidates all moving onto New Hampshire overnight, without any results. But a short time ago, supporters in New Hampshire chanting "President Pete" when they learned of his standing. Bernie Sanders showing his frustration today over the Iowa meltdown. And late today, the Iowa democratic party chairman forced to explain how this could happen, promising full and accurate results, saying the numbers were not compromised, but it was that computer app. ABC's whit Johnson traveling with the candidates, and he leads us off tonight from new Hampshire. Reporter: Even with Iowa in chaos, former South Bend mayor Pete buttigieg arrived in new Hampshire determined to take a victory lap. We are arriving with the momentum in the 2020 presidential campaign right now. And we had a victorious night in Iowa. That shocked opponents. Reporter: He was banking on an Iowa bounce. Just in case you haven't been glued to your phone the last few minutes. Official, verified caucus results are coming in from the state of Iowa. They're not compete, but results are in from a majority of precincts and they show our campaign in first place. Reporter: The preliminary results put buttigieg neck and neck with Bernie Sanders, who was also anticipating success in Iowa. Today, the senator's frustration was palpable. We should all be disappointed. There's no excuse for not having results last night. Reporter: Elizabeth Warren declaring partial results from the Iowa democratic party is just not good enough. I think they ought to get it together and release all of the data. So that's what we need. Reporter: But former vice president Joe Biden perhaps looking to put Iowa behind him, saying, there's no rush. Let's give them time. We don't know precisely how many delegates we have or how many we'll get, but I feel really good about getting more than our fair share. Reporter: Tonight, the Iowa democratic party is under fire for the debacle, which the chairman blamed on a coding error in the caucus app. As chair of the party, I apologize deeply. Reporter: But the turmoil seeming to give at least one of the candidates a new lease on life. What an amazing night we had last night. I'm someone that thrives in chaos. You want a steady hand in chaos, right? Reporter: The caucuses were supposed to sort out the field, winnow it down. And tonight, in a sea of frustrated Democrats, one man was smiling. I hear something happened in Iowa or didn't happen. I don't know which. Still can't figure that out. Reporter: Former New York City mayor Michael Bloomberg skipped Iowa altogether. He's focusing on super Tuesday. And today, the billionaire announced he's doubling the amount of money he's spending in this fight. Perhaps a bit of a gift for mayor Bloomberg. Whit Johnson live tonight from a Bernie Sanders tonight in new Hampshire. And whit, I know you heard the frustration from senator Sanders today about this meltdown in Iowa. And if mayor Pete holds onto this lead, that's quite a headline going into new Hampshire. Reporter: David, it sure is. Mayor Pete buttigieg is trying to make the most out of this moment, as well. He hit eight events in new Hampshire today alone. But this is practically home turf for Bernie Sanders. He won big here four years ago. Elizabeth Warren, also from a neighboring state, she's hoping to make a stand in the new Hampshire primary one week from today. And this will be a big test for former vice president Joe Biden, currently sitting in fourth place out of Iowa. David, that is not where he wanted to be. All right, whit Johnson leading us off tonight. Whit, thank you. And no surprise here, president trump was watching all of this closely and tweeting right away about the chaos in Iowa, calling it an unmitigated disaster, just like they ran the country, the president said.
This transcript has been automatically generated and may not be 100% accurate.