Republicans are defending a 53-47 Senate majority this November, and for most of the past year, forecasters treated that math as close to settled. Democrats need to flip at least four Republican-held seats without losing any of their own, in a map that is offering them few obvious targets. A string of strong generic ballot polls for Democrats, shifting ratings in New Hampshire and Ohio, and a widening gap between rival forecasting models have turned a race that once looked like a formality for the GOP into one of the more genuinely uncertain Senate cycles in years.
Whether that uncertainty reflects real movement in the electorate, a temporary polling mirage, or Democrats simply repeating overperformances that evaporate on Election Day is the question hanging over the 2026 midterms. Here is what five of the most closely watched forecasts say right now, and why they do not all agree. Cook, widely considered the industry standard for nonpartisan race ratings, currently lists seven of the 35 Senate seats on the ballot as toss-ups: Alaska, Iowa, Maine, Michigan, New Hampshire, Ohio and Texas.
The other competitive races are Georgia and North Carolina, which Cook rates as lean Democrat. The biggest recent change came in New Hampshire, where Cook moved the Senate race from "lean Democrat" to "toss-up" on September 15. The race is between Democratic Representative Chris Pappas and former Republican Senator John E.
Sununu, who is seeking a return to the Senate nearly two decades after leaving office. The shift makes the race more competitive for Democrats as they look for seats to defend and opportunities to gain elsewhere. The seven toss-up races also show the range of candidates running this cycle.
In Michigan, former Wayne County health director Abdul El-Sayed defeated Representative Haley Stevens in the Democratic primary and now faces former Republican Representative Mike Rogers. Rogers lost the same open seat by less than a point in 2024. In Iowa, Representative Ashley Hinson is defending the seat of retiring Senator Joni Ernst against state Representative Josh Turek, a Paralympic gold medalist.
Turek has run closer than expected in a state President Donald Trump carried by 13 points in 2024. Cook moved the race from lean Republican to toss-up in August. In Texas, Attorney General Ken Paxton, who defeated Senator John Cornyn in a Republican primary runoff after receiving Trump's endorsement, faces state Representative James Talarico for the seat Cornyn is leaving.
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