The DeSantis campaign is already zeroing in on early calls from all of the TV networks and the AP to blame for their candidate’s performance, calling it “election interference” because parts of the state hadn’t even begun caucusing when the calls came in. We know Republican voters are deeply skeptical of the mainstream media, but DeSantis’s argument that the media is “in the tank” for Trump might be a stretch for Republicans who have spent the last eight years believing the media was out to get Trump.
—Jacob Rubashkin, Inside Elections

One thing that seems tricky right now — maybe not trickier than it has been for the whole primary contest — is that the main reason to have a Trump alternative is for a scenario in which he physically can't campaign because he's in court so much, he actually gets convicted before the RNC (unlikely, but I guess not impossible) or some other major contingency like that. Then, you'll want a Trump substitute. But Haley, for example, has been running as a Trump alternative. Nothing in the process is really conducive to such a fine distinction, even if it were clear that a critical mass of Republicans were invested in either a substitute or an alternative.
—Julia Azari, 538 contributor

To answer your question, Julia, maybe anti-Trump Republicans will coalesce around a single alternative this time (perhaps because they have no choice — it’s possible that DeSantis will drop out after tonight and Haley will be the only Trump critic left). But even if they do, I don’t think it will matter, simply because there are very few anti-Trump Republicans left in the party. Over the past eight years, that breed of Republican has largely limped into retirement or lost in primary or general elections, and the new GOP establishment that replaced them has lined up behind Trump’s campaign. He has more endorsements at this point in the cycle than all but a handful of past candidates.

—Nathaniel Rakich, 538

Julia, I think 2024 is just such a different ballgame than 2016, because now most Republican primary voters like Trump and want him to be president. His image rating is a sky-high 78 percent favorable/19 percent unfavorable among Republicans.. Back in early 2016, he was not as popular — an ABC/Washington Post poll from 8 years ago pegged his favorability among Republicans at just 57 percent and falling. There was not only a sizable anti-Trump contingent in the party back then, one with a lot of establishment clout and resources, but also a sizable number of voters really didn’t want Trump to be the nominee. That’s gone, and with it I think any chance at strategic consolidation like Kasich, Cruz and Rubio tried in 2016.
—Jacob Rubashkin, Inside Elections

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