Final polls point to Democratic House win but Senate outcome remains uncertain

Democrats are poised to win control of the House of Representatives in the upcoming midterm elections, according to the final wave of polling data released on Wednesday. The results show a consistent trend across all recent surveys, although the exact magnitude of the victory and the fate of the Senate remain unclear.

In the last 50 polls conducted, Democrats have led the generic congressional ballot in every instance. Their average lead stands at eight points. This advantage began to widen in September as voter attention turned toward the midterms. The current gap mirrors the lead Democrats held at this point in the 2018 cycle, a year when they gained 41 House seats.

President Donald Trump’s declining approval ratings are weighing on the Republican ticket. A recent CNN poll places his approval rating at 32 percent, which is seven points lower than his standing entering the 2018 midterms. The average approval rating across other polls is 38 percent. These numbers suggest headwinds for Republican candidates across the country.

Forecasters have adjusted their projections based on these trends. The Cook Political Report rates Democrats as the favorite in 220 House seats, which is two more than the 218 needed for a majority. The report projects that Democrats will flip between 12 and 22 seats, securing a comfortable majority in the chamber.

The Senate race presents a different picture. Democrats need to gain a net of four seats to take control. They currently lead or are statistically tied in eight Republican-held states: South Carolina, Alaska, Maine, Kansas, Texas, Iowa, Ohio, and North Carolina. They also lead in Michigan, a seat held by a retiring Democrat. However, all of these races except North Carolina are within the margin of error.

Republicans argue that their voters are undercounted in current polls. Nate Silver’s analysis indicates that in the last three presidential elections, final polling averages understated Republican support by an average of 3.8 points. If this pattern holds in the midterms, it could swing the close races and allow the GOP to retain the Senate. However, since 2016, midterm polls have actually overstated Republican support by just 0.2 percent.

Patrick Ruffini, a Republican pollster, noted that from 2018 to 2024, polls at this stage of the cycle overestimated Democratic support by 6.2 points in specific states, including Iowa, Michigan, and Ohio. This suggests that Republican hopes for a polling error may be overstating the impact of the discrepancy.

Undecided voters in red states remain a variable. CNN polling found that in Texas and Kansas, at least six in ten undecided voters are Republicans or lean Republican. This group could shift the outcome if they turn out in large numbers. Early voting data provides additional context. As of Thursday, over 42 million early ballots have been cast, a pace similar to 2022 and higher than the 39 million cast in all of 2018.

In the states that report partisan breakdowns, Democrats account for 44 percent of early voters, Republicans for 31 percent, and independents for 25 percent. In Maine, Democrats outnumber Republicans in the early vote by more than two to one. In Iowa, the margin is 15 points. In Kansas, the split is closer, with Democrats leading 45 percent to 41 percent.

Michigan offers a specific challenge for Democrats. Early voting data shows that voters under 40 years old make up only 14 percent of the early vote, roughly half of what polls estimate. Republican candidate Mike Rogers holds a 55 percent to 43 percent lead among voters over 45. If young voters do not turn out at the rates predicted, Rogers has a stronger chance of winning than current polls suggest.