Model trims Democratic odds in Ohio's 7th District

Our model now gives the Democrat a 59 in 100 chance in Ohio's 7th Congressional District, down from 68% in our run of August 16. That is a drop of 8.6 points of Democratic win probability over six days.

The expected margin moved with it. Our model's mean margin in the district is now D+2.5, against D+4.9 in the earlier run. The spread around that center is wide: our 5th-to-95th percentile range runs from R+14.5 to D+19.1, compared with R+12.2 to D+21.7 a week ago. A race with that much room on either side of even is close, and the shift in probability is smaller than it sounds against that range.

No new polling of the district appears in this payload. The movement is the model's, and we are not going to attach a cause to it that we cannot show. Nationally, our generic ballot average stands at D+6.7 across 24 polls fielded in the last 45 days.

The district sits inside a national picture our model still reads as favorable to Democrats in the House. Our estimate gives Democrats a 94% chance of winning a majority there, with a mean of 242.7 seats against the 218 needed. That figure carries a caveat of our own making: our simulation draws error at the national, census-division, state and district levels, but it has no term linking demographically similar districts scattered across the map, because we lack the cluster data to build one. The effect is that our House control number is marginally firmer than a fuller treatment would leave it. We cannot say by how much for this run, so we do not put a figure on it.

In the Senate, our model gives Democrats a 47% chance of control, with a mean of 50.1 seats against the 51 they would need; Republicans need 50, because the payload notes a 50-50 tie goes to them on the vice president's vote.