CNN/SSRS poll has Michigan Senate race close, and our estimate does not move

A CNN/SSRS survey of 843 likely voters in Michigan, fielded August 31 to September 6, put Democrat Abdul El-Sayed at 47 percent and Republican Mike Rogers at 44 percent. That is a three-point gap on a sample of that size, which is close.

Our forecast is unchanged. The model gives El-Sayed a 69 in 100 chance of winning the open seat and Rogers 31 percent, with a mean margin of D+5.5. The run before this one, at 12:32 PM ET the same day, had the same figures. The only difference is at the edges of the distribution: our 5th-to-95th percentile range now runs from R+12.5 to D+23.6, against R+12.4 to D+23.4 before. That is noise, not news.

The pattern is the more informative part. Our Michigan estimate has sat at 69 percent since late August, and the new CNN/SSRS numbers land close enough to our mean margin that they neither pull the average nor tighten it much. A single poll showing a small gap in a race our model already treats as competitive is confirmation, not new information. The wide percentile range is a reminder that our simulations still allow outcomes well into double digits for either candidate.

Nationally, our Senate picture is separate from the Michigan one and points the other way. Our model gives Democrats a 41 percent chance of winning Senate control and Republicans 58 percent, with a mean of 49.7 Democratic seats. Democrats need 51 seats for a majority; Republicans need 50, because the vice president is a Republican and a 50-50 tie goes to them. Our generic-ballot average, drawn from 25 polls over the past 45 days, stands at D+6.3 — a reflection of how much the Senate map, rather than the national environment, is doing the work in that number.