Republicans hold the Senate 53-47, which means Democrats need a net of four seats to take the majority outright — a brutally steep hill on this map. With Michigan settled and Tuesday’s primaries about to lock in more matchups, here is our ranking of the nine seats most likely to flip, from most to least.
1. North Carolina (R-held, open)
Thom Tillis’s retirement left Republicans defending an open seat in the country’s most stubbornly narrow state. Open R-held seat, purple state, hostile environment: this is the Democrats’ best flip opportunity on the board, and it is not especially close.
2. Maine (R-held, Collins)
Susan Collins has survived every wave thrown at her, but she has never run in a midterm with her party holding the White House and an approval-underwater president. Her filibuster institutionalism plays well at home; the fundamentals do not. Every cycle we say Maine is the year Collins math breaks. Eventually one of these cycles will be right.
3. Michigan (D-held, open)
The cycle’s widest range of outcomes. Abdul El-Sayed’s primary win gives Democrats a turnout thesis and Republicans a caricature; the GOP nominee is openly courting Stevens Democrats. Pure toss-up energy in a state Trump carried in 2024. Full preview here.
4. Georgia (D-held, Ossoff)
Jon Ossoff is the only Democratic incumbent defending a state Trump won, which makes him the GOP’s single best target. His saving grace: Georgia Republicans spent the cycle in a messy nomination fight, and Ossoff has raised money like an incumbent who knows exactly what is coming.
5. Minnesota (D-held, open)
Tina Smith’s retirement should not put this seat in play — Minnesota has not gone red statewide in decades. But an open seat, a fierce Craig-Flanagan primary, and a GOP field led by a celebrity outsider give it a nonzero pulse. If Minnesota is genuinely close in October, Democrats are having a catastrophic night everywhere.
6. New Hampshire (D-held, open)
Jeanne Shaheen’s retirement opened a seat in a state that loves ticket-splitting. New Hampshire’s Democratic lean in federal races is real but shallow. The eventual GOP nominee’s quality decides whether this is a race or a footnote.
7. South Carolina special (R-held, Graham seat)
Deep-red state, so a flip is a long shot — but special elections are chaos machines, the GOP field is crowded and fractious with Ralph Norman leading and Mark Sanford lurking, and a possible August 25 runoff means two more weeks of intraparty fire. Rate the flip odds low and the entertainment value maximum. Tuesday’s primary preview.
8. Ohio special (R-held, Husted)
Appointed senators underperform, and Ohio Democrats have won specials before. But Ohio’s rightward drift is now three cycles deep, and it would take a genuine wave plus a flawless campaign to make Jon Husted sweat past Labor Day.
9. Texas (R-held)
The dream that never dies. A bruising Republican nomination fight left real scars, and Democrats have an energetic candidate class led by figures like James Talarico working to expand the electorate. Texas remains Texas — but if the bottom falls out nationally, this is where a 2018-style near-miss becomes something more.
Squint at the board and the problem is obvious: Democrats’ two most vulnerable seats (Michigan, Georgia) rank above most of their targets. A plausible great Democratic night nets two or three seats — and still leaves Republicans holding the chamber. The realistic 2026 Senate question is not majority; it is margin, and what that margin means for 2028. Ratings update continuously on the main board.