US midterms reach election day with three possible congressional outcomes

Polls favor Democrats, but surprise outcomes remain possible

The 2026 US midterms reached election day on Nov. 3 after months of campaigning and billions of dollars in spending, with control of both chambers unsettled. Latest public opinion surveys gave Democrats the upper hand, but BBC News North America correspondent Anthony Zurcher said polls had not always been reliable and surprise results remained possible. His analysis separated the possible outcomes into a Democratic wave, a narrow Democratic outcome and continued Republican control of both chambers.

Historically, midterm elections tend to favor the out-of-power party. Zurcher said polls suggested Trump was historically unpopular. BBC’s analysis also cited a war with Iran that had driven up consumer costs, along with policies involving immigration enforcement and support for data center construction. Together, those conditions could create the electoral wave described in the first scenario.

Turnout was the first major dividing line. In the Democratic-wave scenario, Zurcher said Democrats might boost turnout among their own voters and win independent voters by sizable margins. The coalition could reverse Trump’s 2024 inroads with Hispanic voters and young men; some Republican voters might support Democrats or stay home.

For the narrow outcome to emerge, the high Democratic turnout seen during early voting would have to be matched by a Republican surge on election day. Trump’s efforts to rally his base in Republican red states could help Republicans avoid the Democratic-wave scenario, while races at or near the margin of error might produce mixed results for both parties. Under continued Republican control, Republican voters would have to turn out in unexpectedly impressive numbers, while independent and Hispanic voters who seemed to have soured on Trump’s policies would have to support him.

The polling conditions also varied by scenario. In the narrow Democratic outcome, Zurcher said the polls might be neither entirely wrong nor entirely right. For Republicans to retain both chambers, the polls would need to be wrong and the toss-up races would have to fall mostly to Republicans. Zurcher noted separately that polls had previously underestimated Trump’s support.

Democrats could take control of the House and far surpass the 218 seats needed for a majority. Zurcher said they might win not only the dozen or so races analysts rated too close to call but also seats in more solidly conservative territory.

In the narrow Democratic outcome, Democrats could win enough House races for a majority, but not a sizable one. Democratic leaders would then have to regularly wrangle with members on the left and the center to ensure they had enough votes to pass legislation.

Under continued Republican control, House control could come down to California and its extended, days-long counting process for mail-in ballots. BBC’s analysis said Republicans might eke out a slim overall majority partly because of efforts to draw more favorable congressional district lines in Texas, Florida and North Carolina.

A Democratic Senate wave would require victories in all or most of the current crop of toss-up races, including contests in traditionally conservative states. Zurcher said such a result would include at least one victory in Texas, where no Democrat had been elected in a generation, or in Kansas, where no Democrat had been elected in nearly a century. Democrats would hold the chamber with a seat or two to spare. Zurcher said that cushion might avoid drama around a potential Republican legal challenge in Alaska, where a judge had dismissed a Trump administration lawsuit over two Dan Sullivans being on the ballot.

The Senate would yield only one or two flips in the narrow Democratic outcome. North Carolina appeared all but assured to move into the Democratic column, while contests in the conservative heartland would prove out of reach. BBC’s analysis said Democrats might be unable to unseat Republican Senator Susan Collins in Maine, that Democratic candidate Abdul El-Sayed might fail to keep Michigan in the Democratic column, and that the dispute over the competing Dan Sullivans might be enough to sink Democratic candidate Mary Peltola in Alaska.

Under continued Republican control, Republicans could win every Senate contest in conservative states and flip Michigan, a seat held by Democrats heading into the vote. Even if Republicans did not hold North Carolina or win in Democratic-controlled Minnesota or New Hampshire, Zurcher said those races on the periphery of competitiveness could still make Democratic candidates work hard for the result.

A Democratic wave would leave both chambers under Democratic control. BBC’s analysis described that result as “a stinging rebuke for Trump and his Republican Party” and said it would set up two years of conflict between “a newly invigorated Democratic Party with its hands firmly on the lever of legislative power” and “a president who seldom backs away from a fight.” A narrow result would leave Congress divided; BBC’s analysis called that outcome “a recipe for political gridlock.” If Republicans retained both chambers, Trump might claim a renewed electoral mandate on Wednesday morning and push his domestic and foreign policy agenda with continued Republican congressional support.

BBC’s analysis listed divergent House indicators. A Democratic wave could be indicated by Democrats holding targeted House contests in Florida and winning Republican districts in North Carolina, Michigan, New York, Virginia and Kentucky. A narrow outcome would instead show Florida staying comfortably Republican across the board, Democrats picking up some House seats in Virginia and Pennsylvania, and Republican incumbents on more secure political ground holding their seats. Continued Republican control could include Republican House holds in Pennsylvania and Virginia and flips of Democratic seats in North Carolina, Ohio and Florida.

The Senate indicators were also scenario-dependent. A Democratic wave would include a flip in South Carolina, while continued Republican control would be indicated by re-election victories for Senators Ashley Moody in Florida and Jon Husted in Ohio.

The guide did not declare a winner. It identified turnout, polling, statewide House results and several Senate contests as the measures that would distinguish broad Democratic gains, a narrow split or continued Republican control.