A new RealClearPolitics analysis is laying out what strong 2026 midterm performances could look like for both parties, with Democrats currently holding a substantial advantage on the national generic congressional ballot but several Senate contests remaining close.
As of the analysis published September 22, Democrats led Republicans by 8.1 percentage points in the RealClearPolitics generic-ballot average. RCP noted that this represented a 10.8-point Democratic swing compared with the 2024 national House vote.
Those numbers are snapshots, not election results or guarantees. RCP itself emphasizes that relatively modest changes in polling, or differences between polling and actual voting, could substantially change the November outcome.
Under the analysis’s Democratic best-case scenario, the party would maintain or improve upon its current national polling advantage. RCP calculated that Republicans could potentially gain around 10 seats through redistricting if newly drawn maps perform as intended. Even accounting for those changes, the analysis estimated a Democratic House total of approximately 230 to 238 seats under its strongest scenarios.
Best-Case Midterm Scenarios for Democrats and Republicans https://t.co/7n2iiIlxuc
— RealClearPolitics (@RCPolitics) September 21, 2026
The Senate presents a different puzzle.
RCP currently categorizes Georgia and North Carolina as Lean Democratic, while Democrats lead in seven of nine races the organization considers toss-ups. Those include contests in Texas, Ohio and Alaska, states that President Trump carried by double-digit margins in 2024.
If Democrats won the Senate races where RCP’s analysis says they currently lead, the party would reach 52 seats. RCP described an even larger Democratic Senate majority as a possible best-case scenario if additional competitive states moved their way.
Republicans, however, have their own potential path through the polling landscape.
In the House, RCP noted that 14 Republican-held districts were decided by four percentage points or less in 2024. Its Republican best-case scenario assumes the national political environment becomes more favorable to the GOP during the final weeks and that current polling is overstating Democratic performance by several points.
The Republican path to retaining the Senate is less dependent on a large national shift because several individual races remain close. According to RCP, three toss-up contests currently have Democratic candidates leading by two points or less, while five have Democratic advantages of three points or less.
RCP also has Republicans ahead in Iowa, Kansas, South Carolina and Florida, although individual surveys have shown varying levels of competitiveness in those states.
Under the analysis’s Republican scenario, holding Republican-leaning states along with Iowa, Kansas, Texas and Alaska would produce 50 GOP Senate seats. With a Republican vice president able to cast tie-breaking votes in an evenly divided Senate, that configuration would allow Republicans to control the chamber. RCP also outlined scenarios reaching 51 to 53 Republican seats if the party performed better in additional competitive races.
The important word in all of these calculations is “scenario.”
They are not forecasts of what will happen on Election Day. They illustrate how dramatically control of Congress could change depending on whether today’s polling holds, narrows or proves different from the final vote.
With six weeks remaining, that leaves both parties staring at the same collection of polls and finding very different routes through November.
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