8 Senate Races Could Decide When 2026 Control Is Known

Eight Senate races rated as toss-ups by NBC News will largely determine how quickly the network can call control of the chamber on election night, according to the network's Decision Desk team of John Lapinski, Stephen Pettigrew and Marc Trussler. Republicans currently hold narrow majorities in both the House and Senate, and Democrats are trying to flip at least one chamber in the final two years of President Trump's term, NBC News reports.

How Many Senate Seats Are Actually in Play?

NBC News rates eight Senate contests as toss-ups — meaning the network's analysts see no clear favorite based on current data. Four of those races are in Alaska, Iowa, Kansas and Ohio, per the network's ratings. Because Republicans hold only a narrow Senate majority heading into the 2026 midterms, a shift of just a handful of seats among those eight toss-ups could flip control, NBC News notes. The network adds that Democrats are also favored in a number of other key Senate contests beyond the toss-up list, based on public polling.

What Happened on Election Night in 2024, and Why Does It Matter Now?

Two years ago, the picture cleared fast. Trump's wins in the presidential battlegrounds of Georgia, North Carolina, Texas and Florida meant most Americans went to bed Tuesday night with a good sense of the outcome, NBC News reports, and woke up Wednesday to networks having called enough states to declare him president-elect. That speed is the comparison point for 2026: four states resolved the top of the ticket within hours. This year, by contrast, NBC News says congressional control could hinge on eight separate Senate races plus the House majority, a wider and more fragmented set of contests than a single presidential race decided by a handful of swing states.

By the numbers

• 8 — Senate races NBC News currently rates as toss-ups, the group most likely to decide chamber control.
• 4 — Presidential battleground states (Georgia, North Carolina, Texas, Florida) that gave most Americans a clear 2024 election-night result, per NBC News.

Why Could 2026 Take Longer to Call Than 2024?

Public polling cited by NBC News shows Democrats favored in the House and in a number of key Senate contests. If those numbers hold, the network says it is possible NBC News could project control of both chambers on election night. But the Decision Desk team writes that it is more likely determining winners in the most important races will take time, because the timeline depends on two separate variables: how individual states count ballots, and how close the margins turn out to be in the eight toss-up races and other contested seats.

"Of course, no one, including the Decision Desk, will know what will unfold until election night, but we will have a good sense possibly early in the night of how the contests are trending," the NBC News Decision Desk team writes.

What Are Analysts Watching For on Election Night?

The Decision Desk framing treats election night less as a single event and more as a sequence of signals. Early returns in the toss-up states — Alaska, Iowa, Kansas and Ohio among them — will show whether the Democratic-favored polling environment NBC News describes is translating into actual votes. A lopsided night in those states one direction or the other would let analysts move faster than the 2024 presidential count, which itself took until the following morning for enough states to be called, according to NBC News.

What to Watch on Election Night

• The eight toss-up Senate races, including Alaska, Iowa, Kansas and Ohio, as rated by NBC News — early margins here will signal whether Republicans hold their narrow majority.
• House polling trends — NBC News reports Democrats are favored in public polling for House control; whether that holds in actual returns is a first test of the night.
• Counting procedures by state — NBC News ties the overall timeline not just to how close races are, but to how each state processes and reports ballots.
• Comparison to 2024 — a repeat of that year's fast presidential call, decided by Georgia, North Carolina, Texas and Florida, would be the exception rather than the rule for a multi-race congressional night, per the network's framing.

For the full Decision Desk breakdown of individual races, see NBC News.