Partisan poll shows MN-1 close, but our forecast is unmoved

A new poll of Minnesota's 1st District finds a close race. GBAO, polling for House Majority PAC, surveyed 500 likely voters September 18-21 and put Democrat Jake Johnson at 47% and Republican incumbent Brad Finstad at 46%. A one-point separation in a sample that size does not establish a leader; the sensible reading is that the poll shows the two candidates close together.

Our forecast did not move. The model gives Johnson a 25 in 100 chance of winning the seat and Finstad a 75% chance, with a mean margin of R+6.1. That is identical to our previous run, timed at 2:32 PM ET on September 24. The model's range is wide: it puts 90% of outcomes between R+20.8 and D+8.5, so a result as close as GBAO's numbers sits comfortably inside what we already expected without being the central case.

One reason the poll does not shift things much is who paid for it. GBAO conducted the survey for House Majority PAC, a partisan sponsor, and our average discounts polls of that kind. The survey is also the only public polling of MN-1 in the payload, which limits how much any single number can pull the estimate.

Nationally, our average of 30 generic-ballot polls over the past 45 days stands at D+8.3. Our model gives Democrats a 98% chance of winning at least the 218 seats needed for House control, with a mean of 245.7 seats. That figure comes with a caveat of our own making: our simulation correlates error nationally, by census division, by state and within each district, but we have no cluster data to correlate demographically similar districts across state lines. Without it, the 98% is marginally firmer than a fuller model would render it. In the Senate, where Democrats need 51 seats because a 50-50 tie goes to the Republican vice president, we give them a 52% chance of control.