Minnesota poll has Democrat at 50-45 as our forecast eases to 87 percent

A Deep Root Analytics survey of 597 registered voters in Minnesota, fielded August 17-18, put the Democrat at 50 percent and the Republican at 45 percent. It is the only new poll in this race in our payload.

Our model now gives the Democrat an 87 in 100 chance in the Minnesota Senate race, with a mean margin of D+7.5. Before this run, at 10:30 a.m. ET, it was 92 percent and D+9.2. The plausible range widened at the Republican end: our 5th-to-95th percentile band now runs from R+3.4 to D+18.6, against R+1.6 to D+20.1 earlier.

That is a directional shift, not a reordering. A five-point Democratic edge in a poll of registered voters sits below what our model had been carrying for this seat, so the average pulled toward it and the uncertainty around it grew. The race remains one our model treats as clearly more likely than not to go to the Democrat, and the mean margin is still close to the national picture: our generic-ballot average stands at D+6.7 across 24 polls over the past 45 days.

Minnesota is an open seat, currently held by Democrat Tina Smith. Our records list no declared candidates for it, so nothing here rests on the identity of the two nominees.

The seat matters to the wider Senate arithmetic. Our model puts the mean number of Democratic seats at 50.2, with 51 needed for a Democratic majority and 50 enough for Republicans, because the vice president is a Republican and a 50-50 tie goes to them. On those terms we give Democrats a 47 percent chance of winning Senate control and Republicans 53 percent. A shift of five points in one state's win probability does not move that balance much, but it moves it in the Republicans' direction.