DeSantis is asked about the Florida education guidelines on teaching slavery. He immediately calls it a hoax and attacks Vice President Kamala Harris (America's first Black vice president), which has been his campaign's strategy on this issue since it first broke. The moderators are quick to tee up a discussion between DeSantis and Scott, though, since the South Carolina senator was among the most outspoken Republicans against the DeSantis plan.
-Jacob Rubashkin, 538 contributor

Moderators questioned Haley on "school choice." Seven Republican states, including Florida, passed "universal school choice" this year, which mostly means vouchers for private schools that are available to nearly all students, without income limits. Public school supporters have said these vouchers are a backdoor way of defunding public schools. In most states, states take the per-pupil allocation of tax dollars and give the money directly to parents instead, allowing them to pay for private, religious, or homeschooling courses. In many states the vouchers could go to parents who could otherwise pay for private school, and aren't enough to pay for full tuition for parents who couldn't afford it. The public is divided on these policies, but trust in public schools and public education has been declining, especially among Republicans.
— Analysis by Monica Potts of 538

Asked about the challenges of high health care costs for Americans, Haley argued that the system needs a major overhaul, from the insurance companies to hospitals, with improved transparency for patients so they have more options and better knowledge of the costs they'll face. Still, this issue isn't as high on Republicans' list of key issues. In a recent Economist/YouGov survey, 58 percent of Republicans said "heath care" was a very important issue. That sounds high, but 81 percent said the same of jobs and the economy, 81 percent of national security and 77 percent of immigration. It's not the 2010 tea party era anymore, or even 2017, when the GOP failed to get rid of Obamacare while in full control of the government.

— Analysis by Geoffrey Skelley of 538

In polling for EdChoice conducted by Morning Consult in August, 46 percent of Republicans strongly or somewhat support school vouchers, while 11 percent strongly or somewhat oppose vouchers, 27 percent say they have never heard of them, and 16 percent don’t know. After being provided a definition, support for vouchers among Republicans increased to 70 percent, and opposition increased to 19 percent.
—Analysis by 538

The second debate stage will look mostly like the first, as seven of the eight candidates who took part in the initial August debate qualified for tonight’s event. And just like the first debate, front-runner Trump has decided to skip the event, despite having the polls and donors to make it. To qualify, the RNC mandated that candidates have at least 3 percent support in two national polls, or at least 3 percent in one nationwide survey and two polls from separate early states, based on polls conducted since Aug. 1 that met the RNC’s criteria for inclusion. Candidates also had to attract at least 50,000 unique contributors, with at least 200 from 20 different states or territories.

The RNC raised the polling and donor standards for the second debate, which slightly winnowed the list of participants. The new rules raised the level of support candidates needed in qualifying polls from 1 percent to 3 percent, and the number of unique donors from 40,000 to 50,000. Six of the seven qualifying candidates had little trouble meeting these polling and donor thresholds. However, although Burgum had enough donors, he struggled to poll well enough nationally to qualify. It took until the Saturday before the debate for him to get the national poll at 3 percent he needed. Meanwhile, former Texas Rep. Will Hurd and former Arkansas Gov. Asa Hutchinson came up short of qualification, as Hurd lacked sufficient polls and only got to 50,000 donors on Monday, while Hutchinson didn’t have enough qualifying polls or donors.

—Analysis by Geoffrey Skelley of 538