Quantus has Cooper up five in North Carolina, and our model stays at 92 percent

A Quantus Insights survey of 686 likely voters in North Carolina, fielded September 21-22, puts Democrat Roy Cooper at 48.4 percent and Republican Michael Whatley at 43.3 percent, with 0.5 percent for another candidate. That is a margin of about five points, narrower than the margin our model carries for the race but pointed the same way.

Our forecast gives Cooper a 92 in 100 chance in this open-seat contest, with a mean margin of D+8.2 and a 5th-to-95th percentile range running from R+1.3 to D+17.8. The run before this one, at 8:32 AM ET, had Cooper at 93 percent with a mean margin of D+8.5 and a range of R+1.0 to D+18.0. The new number did essentially nothing: one point of probability, three tenths of a point of margin. Cooper's standing in our model has been in this neighborhood for about a week, and the Quantus poll fits inside it rather than pushing against it.

Worth keeping in view is what the range says. Even at 92 percent, our simulations still produce outcomes at the low end where Whatley wins narrowly; the 5th percentile sits at R+1.3. A probability is not a prediction, and an eight-point mean margin in September is not a settled result.

Nationally, our model gives Democrats a 54 in 100 chance of Senate control, with a mean of 50.6 Democratic seats. Democrats need 51 seats for control and Republicans need 50, because the vice president is a Republican and a 50-50 tie goes to the Republicans. That arithmetic is why a seat our model already treats as likely Democratic still matters to the chamber picture: the mean sits within half a seat of the threshold. Our generic ballot average stands at D+8.1 across 30 polls over the past 45 days.