Using military force in Mexico has become one of DeSantis's signature planks. In the past few months he's talked about sending special forces to confront the cartels, and didn't rule out firing missiles into Mexico either. It's a heavy-handed proposal that just a few years ago probably would have been major news but these days is pretty par for the course for more and more GOP officeholders.
-Jacob Rubashkin, 538 contributor

A plurality (31 percent) of Republican voters in a NewsNation poll from July said that drugs and substance abuse was the overall root cause of crime in their community. Twenty-three percent said the breakdown of the family unit was to blame, followed by 17 percent who listed underfunding of law enforcement. Systemic racism was the least mentioned issue, with just 3 percent of Republicans saying that it was the overall root cause of their community’s crime.
—Analysis by 538

Christie gets the first question out of the break on how to handle crime, and he made the case that he's the only person on stage whose done it as a former prosecutor. But he turned the question into an attack on Trump, calling out Trump for skipping out on the debate, saying that soon he'll be called "Donald Duck" for avoiding it. The thing is, Christie has essentially a 0 percent chance of winning the GOP nomination, so it's not especially interesting to hear him go after Trump. Earlier in the debate, DeSantis did echo an attack Christie made by hitting Trump for not being on stage to defend the former president's record on spending. More of those kind of dings from anyone besides Christie would be a development in this debate.

DeSantis stands by his decision to suspend two elected prosecutors in Florida, and says he'll bring civil rights cases (?) against local prosecutors as president.

-Jacob Rubashkin, 538 contributor

In anticipation of tonight’s debate, we again partnered with The Washington Post and Ipsos to ask likely Republican primary voters what they think about tonight’s debate participants and the candidate field in general.

The 5,002 likely Republican primary voters we polled using Ipsos’s KnowledgePanel expect DeSantis and Ramaswamy to perform best, out of the seven-candidate field. According to a five-point scale that we calculated using respondents’ answers (with 1 being “terrible” and 5 being “excellent”), likely voters expected both DeSantis and Ramaswamy to perform “very good” (3.44 and 3.43 out of 5, respectively). They thought Haley would perform third-best (3.40 out of 5) and Scott fourth (3.20 out of 5). All of this is fairly in line with their pre-debate expectations in August.

When it comes to which candidates respondents are interested in, Haley saw the biggest bump since our poll before last month’s debate — 31 percent are now considering voting for Haley, up from 25 percent. Although she now has the third-most prospective support, she’s still got a long way to go compared to Trump (66 percent) and DeSantis (49 percent). About 1 in 4 likely Republican primary voters are also considering voting for Ramaswamy and Pence.

We’ll be watching to see how the candidates fare tonight, and if debate watchers’ opinions on who they’re considering voting for will change after tonight’s performances.

—Analysis by Holly Fuong of 538