Trump maintains a lead of 33 percentage points over Haley, his nearest competitor in New Hampshire, according to the most recent polls. Haley appears to have benefitted the most from the first debate in the state, gaining 8 points compared to her average result on Aug. 23. No other candidate’s average has moved by more than 3 points, either up or down.

According to a September survey from the University of New Hampshire/CNN, only 36 percent of likely New Hampshire primary voters have definitely decided who they plan to vote for. Thirty-eight percent said they are leaning toward someone, and 24 percent said they are still trying to decide. Trump’s voters, however, were much more firm on their choice: Sixty-nine percent said they have definitely decided, compared with 31 percent for Ramaswamy and less than 20 percent for the other candidates.

When it comes to policy, New Hampshire Republican primary voters seem particularly concerned about economic issues, according to a September survey by NMB Research for the Competitiveness Coalition and the Josiah Bartlett Center for Public Policy. Given a list of issues that have been raised in the primary, 32 percent said the most important issue to them would be reducing federal budget deficits by cutting spending; 21 percent said it would be spending less on green energy by repealing parts of the Inflation Reduction Act; and 18 percent said it would be keeping taxes low. The only other issue to reach double-digit support was deploying the U.S. military to the Mexican border to stop illegal drugs from entering the country, which was named as most important by 19 percent of voters.

—Analysis by 538

We at 538 have been tracking how many days each candidate has spent campaigning in each state. And some interesting patterns have emerged:
Some candidates — like Ramaswamy and Haley — have really focused on retail politics, while others — like Trump and Scott — have held relatively few campaign events. (Perhaps their strategy is more reliant on TV ads.)>
Hutchinson, DeSantis and Pence have focused their campaigning on Iowa, whose culturally conservative and religious GOP electorate may be a good fit for their politics. By contrast, Christie and Hurd have focused their efforts on New Hampshire, whose large population of independent voters may be more receptive to their anti-Trump message.
The candidates are largely ignoring Nevada, even though it’s the third state on the primary calendar. Through Tuesday, the 10 major candidates have spent a total of 162 campaign days in Iowa and 124 in New Hampshire, but only four in Nevada!

—Analysis by Nathaniel Rakich of 538

Trump maintains a lead of 32 percentage points over his nearest competitor in Iowa, according to the latest polls. Trump and Haley have both improved their polling by about 6 points since the August debate, while DeSantis’s numbers remain virtually unchanged.

According to an early September Emerson College poll, 79 percent of likely caucusgoers who say they plan to vote for Trump also say they are definitely going to vote for him. By contrast, voters who support other candidates say they might change their mind: Seventy-one percent of Scott supporters, 70 percent of Haley supporters, 56 percent of DeSantis supporters and 46 percent of Ramaswamy supporters indicated they could vote for a different candidate.

And in a September survey from Beacon Research/Shaw & Co. Research/Fox Business, 46 percent of likely Iowa caucusgoers list Trump as their first-choice candidate, but only 7 percent list Trump as their second choice. This may indicate that consolidation in the rest of the Republican field could significantly reduce Trump’s lead in the state, as few voters who aren’t already indicating support for Trump seem interested in voting for him.

—Analysis by 538

—Galen Druke of 538

At several points during the second hour of the debate, it got particularly heated between former South Carolina Gov. Nikki Haley and someone she appointed to the U.S. Senate in 2013: Tim Scott.

Haley first went after Scott for not completing what he touted as his economic policy accomplishments.

“I appreciate him. We've known each other a long time. But he's been there 12 years and he hasn't done any of that. He has, they've only given four audits on time,” she said.

Then came a heated back-and-forth before Haley repeated, “Twelve years, where have you been? ... Bring it, Tim.”

The two also fought over Haley’s gas tax in South Carolina.

“​​I would love to finish my conversation with Nikki as it relates to the job that needs to get done. Nikki offered a 10-cent gas tax increase in South Carolina. Talk about someone who has never seen a federal dollar,” Scott said.

Haley then told Scott to do his homework regarding the spending and gas tax in South Carolina. He responded, “just go to YouTube.”

Haley ended the exchange by telling Scott that he was “scrapping right now” (as in scrambling).

“You are scrapping right now, you are scrapping. You know, I fought taxes, I cut taxes, I took care of South Carolina and you know it.”

They then got into a rift over a set of over $50,000 customized curtains for the State Department in the official residence of the ambassador to the United Nations. Haley was the first to live in the new residence.

–ABC News’ Abby Cruz, Gabriella Abdul-Hakim and Isabella Murray