One issue where Haley stands out is in foreign policy. Her history as Trump's ambassador to the United Nations gives her experience, and her policy positions place her at odds with the frontrunner. The Republican Party has followed Trump's lead in recent year's and become more isolationist. But Haley has taken a more traditional stance and has called for continuing aid to Ukraine, an issue that's becoming less popular with her party's voters. But she also has taken a hard line against China and supports continuing aid for Israel, which the Republican base also supports.

—Monica Potts, 538

Looking at towns where the vote is mostly counted, Trump is overperforming his 2016 benchmarks — but then again, he should be, since in 2016 he won with 35 percent of the vote in a many-candidate field. Trump will hope that the returns look like those in Farmington, where he's currently up 29 percentage points compared to his 2016 margin. But Haley will hope they look more like Newmarket or Conway, where Trump is only up by 15 or 16 percentage points.

— Dan Hopkins, 538 contributor

If voters in New Hampshire are thinking about the general election, Dan, that could be a problem for Trump. Last week, just 52 percent of Iowa caucusgoers voted for Trump. But according to a December YouGov/CBS News poll, likely New Hampshire GOP primary voters view the former president differently than those in Iowa. In that survey, 64 percent of likely voters in Iowa said that Trump would definitely beat Biden in November, while only 51 percent of New Hampshire voters said the same. Voters who said they were considering other candidates also had different reasons in the two states: 70 percent of likely New Hampshire voters who were considering voting against Trump said that one reason, of those provided to them, was that Trump is controversial, while only 57 percent of Iowans considering other candidates said the same. And more New Hampshirites were concerned about Trump's ability to beat Biden than Iowans considering other candidates.

—Mary Radcliffe, 538

Again per the Associated Press via The New York Times, Trump leads Haley 53 percent to 46 percent with 12 percent of the estimated vote counted. That's closer than the polls foresaw, but obviously not good enough for Haley so far.

—Nathaniel Rakich, 538

At around 4:30 p.m., Americans for Prosperity Regional Director Greg Moore said on X (formerly Twitter) that he'd heard from sources in the New Hampshire secretary of state office that towns around the state had gone through more than 80 percent of GOP primary ballots available statewide, and that some towns were calling to ask for more to avoid running out. Polls in much of the state closed at 7 p.m Eastern, but a few places are open until 8 p.m.

Now, the Koch-affiliated AFP endorsed Haley to much fanfare earlier this cycle, so high turnout certainly would make Haley supporters feel hopeful about the number of independent voters taking part in the primary, who generally are more likely to support Haley than Trump. Still, ABC News's current total expected vote total in New Hampshire is 330,000 votes. Although that figure may change as the night wears on — it could go higher or lower — that many votes would represent nearly 30 percent of the state's entire voting-eligible population — that is, anyone who is eligible to register and vote. A turnout rate at that mark would be on par with the highest turnout in the state's modern history, which was the highly-competitive 2008 Democratic presidential primary.

—Geoffrey Skelley, 538