Ramaswamy introduced himself to a national audience from center stage, arguing that an outsider is needed to move America forward.

"First, let me just address a question that is on everybody's mind at home tonight: Who the heck is this skinny guy with a funny last name and what the heck is he doing in the middle of this debate stage? I'll tell you, I'm not a politician. Bret, you're right about that. I'm an entrepreneur," Ramaswamy told co-moderator Bret Baier.

"Now is our moment to start running to something to our vision of what it means to be an American today. If you have a broken car, you don't turn over the keys to the people who broke it again. You hand it over to a new generation to actually fix the problem. That's why I'm in this race, and we're just getting warmed up."

In his response on how to steady the economy, Christie pointed to his record taking on debt in New Jersey and argued he could do the same in to "fight waste" in Washington -- invoking a cut-the-spending mentality that has long been popular among conservatives but became less prominent with Trump's rise, as he focused on other initiatives.

"We cannot sit by any longer and allow the kind of spending that is going on in Washington," Christie said. "Every dollar they spend is a dollar that these people are not allowed to spend on their children and grandchildren. It is robbing our country and it is wrong."

Scott also jumped on government spending as a major problem, touting his votes against legislation by Democrats.

"Over the last several years, I've had an opportunity to vote against spending package after spending package after spending package," Scott said. "And we also need to understand is that Joe Biden's Bidenomics has led to the loss of $10,000 of spending power for the average family."

Interesting early questions by the Fox News hosts. DeSantis got to go first, understandably, and he didn't face any questions about his tenure as governor. By comparison, when the hosts turned to Christie and Scott, they faced questions about state debate in Christie's case and Scott's voting record on spending bills. Both seemed caught a little off balance by actual scrutiny of their records.
-Analysis by Geoffrey Skelley of FiveThirtyEight

Interesting early questions by the Fox News hosts. DeSantis got to go first, understandably, and he didn't face any questions about his tenure as governor. By comparison, when the hosts turned to Christie and Scott, they faced questions about state debate in Christie's case and Scott's voting record on spending bills. Both seemed caught a little off balance by actual scrutiny of their records.

The 2024 presidential election has been underway for months, but with tonight’s first Republican primary debate in Milwaukee, we’re kicking off a new phase of the campaign. In these final five months before voting begins, we’re going to have monthly debates, dashes through Iowa, big-money fundraisers — and probably a culling of the field.

Tonight’s debate will feature eight candidates. Front-runner Donald Trump, who has a 37-percentage-point lead in FiveThirtyEight’s national polling average, will not be among them, as he has opted to skip the debate. Instead, we will hear from Florida Gov. Ron DeSantis; entrepreneur Vivek Ramaswamy; former Vice President Mike Pence; Sen. Tim Scott; former U.N. Ambassador Nikki Haley; former Arkansas Gov. Asa Hutchinson; North Dakota Gov. Doug Burgum; and former New Jersey Gov. Chris Christie.

There are a few threads and tensions we’re going to be watching tonight. First, in the absence of Trump, will his challengers’ attempts to position themselves as a more favorable option fall flat? How will candidates make their case for being a better alternative to Trump without having the contrast on stage beside them? Secondly, what sort of friction will we see between the anti-Trump candidates and those running on more similar ideas or rhetoric?

We’ll keep an eye on all this and more. You’ll be hearing from the crew at FiveThirtyEight and ABC News — as well as some new friends at PolitiFact — throughout the night. The Fox News-hosted debate begins at 9 p.m. Eastern, and we have some colleagues on the ground in Milwaukee who will ensure you’re going in with everything you need to know.

Thanks for joining us. Stay tuned as we update the blog with real-time analysis, charts, thoughts, questions, ideas, idle fancies and more. Leading up until the debate starts, we’ll run through the state of the race so far. Once the debate starts, we’ll make sure we’re addressing everything happening on stage, including what issues the candidates talk about, who they attack, how they position themselves and what Americans think.

-Analysis by Maya Sweedler of FiveThirtyEight