Both Haley, who is projected to win third place, and DeSantis, projected to win second, have given very optimistic-sounding speeches. These outcomes have been highly spun in terms of expectations and disadvantages relative to the Trump campaign. As I noted at the beginning of the night, it's not all that typical for major candidates to drop out after Iowa — most stay in to fight in New Hampshire, at least. And that seems to be the case tonight for both Haley and DeSantis, who sought to show the election outcome in the best possible light. But, like a number of long-shot candidates before him, Ramaswamy will end his campaign tonight.

—Julia Azari, 538 contributor

There were a lot of moving parts tonight, so here's a quick summary all in one place:

- Trump is projected to finish first; he currently has 51 percent of the vote.
- DeSantis is projected to finish second; he currently has 21 percent.
- Haley is projected to finish third; she currently has 19 percent.
- Ramaswamy is projected to finish fourth; he is dropping out of the race.

—Nathaniel Rakich, 538

In her speech tonight, Haley linked Biden to Trump, reminding us that both are old (she said both are about 80 years old), and that most Americans don't want another Trump-Biden match up. But Republicans are much less likely than Democrats to admit their candidate is too old, so the audience within her party for that message is small.

—Meredith Conroy, 538 contributor

Johnson County, one of the most diverse, well-educated counties in Iowa, now shows Nikki Haley in the lead … by 1 vote, according to ABC News.

—Mary Radcliffe, 538

Other than his one-vote loss in Johnson County, it's hard to find much that went wrong for Trump tonight. He won a majority of the vote and carried pretty much every demographic category (especially ones that make up the bedrock of the GOP primary electorate). The most Trump-like candidate in the race, who was still siphoning off a chunk of MAGA votes, dropped out and endorsed him. His two main challengers effectively tied, denying either of them the momentum or comeback narrative they desperately sought in Iowa. And you have to imagine the deep-pocketed donors who flooded Iowa with tens of millions of dollars of pro-Haley and pro-DeSantis advertising have to be wondering about their return on investment.

The New Hampshire primary is in eight days and might well be the toughest contest for Trump of the entire primary process, so it's good for him he can approach it with a full head of steam. The window of opportunity for any non-Trump candidate to alter the course of this race, such that it was ever open, is rapidly closing.

—Jacob Rubashkin, Inside Elections