At the beginning of the 2026 election cycle, control of the U.S. Senate looked pretty secure for Republicans. They held 53 seats, plus the tiebreaking vote of Vice-President J.D. Vance. Of the 35 GOP-held seats up for grabs in 2026, 33 were in states Donald Trump had carried by at least 11 percent. One of the other two was held by two-term Republican senator Thom Tillis of North Carolina, a state that Trump had carried three times. The other was in Maine, where Susan Collins had won five times, usually by large margins. Two Democratic-held seats were in states (Georgia and Michigan) Trump had also won, albeit a bit more narrowly, while another (New Hampshire) looked quite winnable by the right Republican.

To flip the Senate under those circumstances, Democrats would have to defend their vulnerable seats, beat Collins, beat Tillis, and then reach into GOP territory to somehow find two more seats. It seemed like too many balls to juggle without dropping one.

But at the start of 2026, as Donald Trump’s job-approval ratings steadily drifted downward, Senate Democrats began getting a series of breaks:

• Tillis got crossways with the White House and decided to retire. Trump cleared the GOP field in North Carolina for RNC chairman Michael Whatley, who had never run for office. Then former Democratic governor Roy Cooper got into the race and instantly opened up a significant lead.


• In Ohio, Democratic former U.S. senator Sherrod Brown, who narrowly lost his seat in 2024, announced he’d run again in 2026 against appointed Republican Jon Husted.


• In New Hampshire, popular GOP governor Chris Sununu chose not to run for retiring Democrat Jeanne Shaheen’s Senate seat, leaving his less-popular older brother John E. Sununu to run.


• Nebraska independent Dan Osborn, who ran a losing yet unusually competitive U.S. Senate campaign in 2024, decided to try again this year against Republican senator Pete Ricketts.


• Three well-funded Republicans entered the U.S. Senate race in Georgia and focused their attention on one another. At the same time, Democratic incumbent Jon Ossoff raised enormous sums of money while making speeches that elevated him to 2028 presidential consideration.


• In Alaska, Democratic former congresswoman Mary Peltola elected to run against vulnerable Republican senator Mark Sullivan.


• In Maine, Democratic governor Janet Mills folded her Senate campaign, giving Graham Platner a clear shot at Susan Collins.


• In Texas, two hardcore conservatives, Ken Paxton and Wesley Hunt, decided to challenge four-term Republican senator John Cornyn.

By the time Paxton forced Cornyn into a runoff and then trounced him, the Senate landscape had been transformed. According to the authoritative Cook Political Report, there are now eight competitive U.S. Senate contests. Three (Georgia, New Hampshire, and North Carolina) lean Democratic; two (Alaska and Texas) lean Republican; and another three (Maine, Michigan, and Ohio) are pure toss-ups. If Democrats win the races they currently lead and sweep the toss-ups, they gain three net seats. Knocking off one of the lean-R seats would flip the Senate. At the moment, James Talarico is even with or ahead of Paxton in Texas polls, and Peltola is even with Sullivan in Alaska. If the already-apparent Democratic wave picks up velocity, both these races should be winnable.

In addition, just outside the list of competitive Senate races are two Republican seats that could easily become competitive: Nebraska, where Osborn is posting impressive fundraising numbers, and Iowa, where the growing unpopularity of Trump and GOP governor Kim Reynolds is lifting all Democratic boats.

This isn’t to say a Democratic Senate is anything like a lead-pipe cinch or that any specific prediction is secure. As Trump showed in 2024, close races can all go in one direction. If Republicans sweep the toss-ups and Democrats and Republicans win the races they are currently expected to win, we’d have the same Senate composition that exists today. The GOP has far more institutional money to throw into key contests, though with candidates like Paxton, the party may need more than it ever imagined to keep them all competitive. And consider this: If either party gets within one seat of Senate control, it could offer the sun and moon and stars to one of the other party’s potential defectors: John Fetterman of Pennsylvania, who almost certainly can’t win renomination as a Democrat in 2028, and Lisa Murkowski of Alaska, whose bipartisan following in Alaska is tailor-made for her state’s nonpartisan top-four primary system.

How much does Senate control matter anyway? It certainly matters to Trump that he finish his term with a compliant upper chamber to confirm his executive- and judicial-branch nominees. And if Republicans lose either congressional chamber, they also lose the power to use the budget-reconciliation process to pass party-line legislation that Democrats can’t filibuster, like the One Big Beautiful Bill Act.

For Democrats, winning the Senate would end the painful era of powerlessness that began when Republicans gained a governing trifecta in 2024 and proceeded to pursue the most extreme partisan agenda in living memory. It would perhaps also represent a step toward a post-Trump future in which each election doesn’t potentially offer a lurch into semi-authoritarianism, culture war, and disillusionment of half the U.S. population.