Democrats are heading into the final week of the 2026 midterm campaign with a sizable advantage in national polling, but uncertainty about turnout and the polling industry’s recent difficulties measuring Republican support are fueling questions about whether that lead will fully translate to Election Day results.
CNN’s latest Poll of Polls, which averages several recent nonpartisan national surveys, shows Democrats holding substantial advantages on the generic congressional ballot, with individual polls conducted in October placing their leads between eight and 11 percentage points.
A New York Times/Siena survey conducted Oct. 12 through Oct. 19 found Democrats leading Republicans 52% to 41% among likely voters, while a CBS News/YouGov poll conducted Oct. 21 through Oct. 23 showed Democrats ahead 53% to 45%.
An NPR/PBS News/Marist survey released Tuesday similarly found Democratic congressional candidates leading Republicans 52% to 44% among likely voters, with Democrats holding a 13-point advantage among independents.
Reuters/Ipsos produced another strong Democratic result Monday, finding Democrats ahead 47% to 36% among registered voters and 53% to 44% among likely voters.
Those numbers create a difficult national environment for Republicans, but strategists remain mindful that polls underestimated Republican strength in each of the past three presidential elections involving President Donald Trump.
The polling errors of 2016, 2020 and 2024 do not necessarily mean the same thing will happen in 2026, particularly because midterm electorates differ from presidential electorates and polling organizations have repeatedly modified their methodologies. One issue receiving particular attention is differential response rates, or the possibility that voters from one party may be more willing than the other to participate in political surveys.
A Washington Post analysis of its September Michigan polling found that voters identified as Democrats were less likely than Republicans to be successfully contacted, but Democrats who were reached were more likely to complete the survey.
The Post noted that Democratic completion rates had increased compared with a similar survey in 2024, while Republican completion rates remained relatively stable, potentially reflecting Democrats’ higher engagement with this year’s election.
Pollsters attempt to compensate for those differences through weighting and likely-voter models, but determining exactly who will cast a ballot remains one of the most difficult parts of election polling. There is substantial evidence that Democratic enthusiasm is genuinely elevated rather than simply a polling artifact, with Pew Research Center finding Democratic supporters 17 points more likely than Republican supporters to describe themselves as “extremely motivated” to vote.
The latest Marist survey also found 91% of Democrats enthusiastic or very enthusiastic about voting compared with 86% of Republicans, while 76% of independents expressed similar enthusiasm.
Early voting provides another data point, although party registration does not reveal how someone actually voted and early-ballot patterns cannot by themselves predict the final result. More than 22 million Americans had already returned ballots by late last week, with analysts finding signs of stronger Democratic participation in several battleground states.
North Carolina has produced especially unusual early-voting numbers, including a sharp increase among unaffiliated voters, whose first-five-day turnout jumped from roughly 134,000 in 2022 to nearly 252,000 this year.
The larger danger for Republicans may be the national political environment itself, with several surveys showing widespread dissatisfaction over the economy, cost of living and President Trump’s job performance.
The Reuters/Ipsos survey put Trump’s approval rating at 32% among adults, while 73% said the cost of living was moving in the wrong direction. Pew separately found Trump at 30% approval earlier this month and reported that 44% of registered voters viewed their congressional vote as a vote against the president compared with 19% who considered it a vote supporting him. But again – who knows if that polling is accurate, either.
