As Meredith and Monica noted, Haley really emphasized electability in her speech. The difficulty with that argument is that poll after poll shows Republicans think Trump is electable in the general. For example, this YouGov/The Economist poll from early January shows 82 percent of Republicans saying Trump would definitely or probably win the general election, but only 37 percent say the same about Haley.

—Mary Radcliffe, 538

Haley promised to stay in the primary race at a speech tonight just after 8 p.m., when most news organizations had projected the race for Trump. She again made her pitch as one of electability, and slightly attacked the front-runner, Trump, to cheers from the crowd. "The worst kept secret in politics is how badly the Democrats want to run against Donald Trump," she said, saying Biden could defeat him but that she could win. With Trump, the story is court cases, chaos, and senior moments, she said. "I've long called for mental competency tests for politicians over the age of 75," she said. "Trump claims he'd do better than me in one of those tests. If he thinks that, then he should have no problem standing on a debate stage with me." It's unlikely Trump would debate her, but the crowd in New Hampshire ate it up, calling Trump a loser and geriatric. "The first party to retire its 80-year-old candidate will win this election," she said. We'll see in her home state of South Carolina, in about a month.

—Monica Potts, 538

Dan, I'm not sure why Trump would risk getting on stage with her, especially when he can just snipe from Truth Social or in whatever town halls get scheduled between now and then. Avoiding the debates has worked wonderfully for Trump so far, and now that he's won New Hampshire, I don't see him adjusting that strategy. I think it would take an actual loss for him to feel pressured to show up. In fact, I don't think we'll see Trump on a debate stage at all this cycle, in the primary or general election.

—Jacob Rubashkin, Inside Elections

In her post-primary speech, Haley tries to goad Trump into a debate. The question is: can Trump resist calls to debate in the long interregnum between now and the South Carolina primary? He has resisted them so far.

—Dan Hopkins, 538 contributor

Big picture, this was a good night for Trump, who gets another win under his belt, avoids the embarrassment of losing an early state, and gets to compete in much more favorable territory from now on. It's obvious he's going to be the Republican nominee for president. But I don't think we should lose sight of the fact that just under half of Republican primary voters in the first two states voted for someone other than Trump, even as his inevitability has become apparent. I do think that should be a cause for some concern among Republicans moving forward, given that the general election will likely be brutally close and even a small drop in Republican support for Trump could prove fatal. The longer Haley stays in, the more data we'll get on just how many GOP voters there are who are not entirely on board with Trump, especially as she steps up her direct attacks on him. There's been so much conversation about Biden's struggles within the Democratic coalition — which are real and worthy of attention — but Trump may face similar challenges as the nominee as well.

—Jacob Rubashkin, Inside Elections