Republicans need only win three of the seven toss-up Senate races to keep control of the upper chamber — with Vice President JD Vance ready to break any 50-50 tie.
The Senate currently sits at 53 Republicans and 47 Democrats (including Vermont Independent Sen. Bernie Sanders). Democrats need a net gain of four seats to retake control.
The fight comes down to seven nail-biters: Maine, New Hampshire, Ohio, Michigan, Iowa, Texas, and Alaska. Republicans hold five of those seats; Democrats hold two.
CNN polling and data journalist Harry Enten said this week the race is dead even.
“You can’t get any tighter than what we’re looking at right now. Democrats with a 50% chance to win the Senate. Republicans with a 50% to hold the Senate. It is even at this point, eight weeks until Election Day.”
Poll-based models give Democrats a 53% chance to win the chamber. Betting odds give them 47%.
Once thought a lock for Republicans, several races have become unexpectedly competitive. Here’s the breakdown of each toss-up:
Alaska
GOP Sen. Dan Sullivan faces former Democratic Rep. Mary Peltola, who won a special election in 2022 and a full term that November before losing reelection in 2024. Peltola has already proven she can win statewide in deep-red Alaska.
Complicating the race: a Republican candidate who shares the name Dan Sullivan is on the ballot. Republicans have accused him of a bad-faith attempt to confuse voters, though he survived eligibility challenges.
Alaska’s ranked-choice voting system is expected to benefit Peltola. She currently leads by an average 2.0%.
Maine
Incumbent GOP Sen. Susan Collins, 73, faces her first reelection since the 2022 Dobbs decision that overturned Roe v. Wade. Collins has carved out a lane as a pro-choice Republican, but she voted to confirm Justice Brett Kavanaugh — who went on to vote to overturn Roe.
The 2026 contest is her first time on the ballot since that development in a state known for electing moderates but leaning slightly Democrat.
Collins was initially set to face Democratic nominee Graham Platner, a progressive outsider, but Platner dropped out after scandals. Former state Senate President Troy Jackson replaced him.
Jackson leads by an average 2.3%, but Collins has a long history of outperforming polls. In 2020, she won by 8.6% against then-state Democratic House Speaker Sara Gideon despite most polls showing Gideon with a high single-digit lead.
New Hampshire
The state hasn’t sent a Republican to the Senate since Kelly Ayotte in 2010. It hasn’t backed a Republican president since 2000.
Republicans are hoping to break the streak with nominee John Sununu, who represented the state in the Senate from 2003 to 2009 and is the brother of former Gov. Chris Sununu. He faces Democratic nominee Rep. Chris Pappas, who leads by an average 2.0%.
They’re competing for the seat of Democrat Sen. Jeanne Shaheen, who is not seeking reelection.
Ohio
GOP Sen. Jon Husted is facing former Democrat Sen. Sherrod Brown, who is hoping to reclaim a spot in the state’s delegation after losing his seat to GOP Sen. Bernie Moreno in 2024.
Husted was appointed to fill the seat vacated by Vice President JD Vance in early 2025. He previously served as the state’s lieutenant governor. Brown served three terms in the Senate.
While Ohio has moved from swing state to Republican-leaning in recent years, Husted may suffer from his status as an appointed officeholder. Appointees tend to underperform when placed on the ballot.
Brown leads by an average 2.6%.
Michigan
The state poses the most likely opportunity for Senate Republicans to gain a seat this cycle. With Democrat Sen. Gary Peters not seeking reelection, the November race has been boiled down to former GOP Rep. Mike Rogers and Democratic candidate Abdul El-Sayed, a progressive.
Rogers previously lost a close 2024 Senate contest to now-Democrat Sen. Elissa Slotkin and did not face a serious primary challenge this cycle.
El-Sayed narrowly defeated Democratic Rep. Haley Stevens for the party nomination. Though polls indicated a landslide for him, he substantially underperformed those projections and only narrowly clinched the nomination.
Rogers has attempted to paint El-Sayed as a radical, pointing to his support from far-left organizations and his association with streamer Hasan Piker. El-Sayed has distanced himself from some groups, like the Democratic Socialists of America, and rejected the “socialist” label outright.
El-Sayed currently leads by an average 1.7%.
Iowa
Like Ohio, Iowa has drifted toward Republicans in recent cycles. The contest is noticeably the only toss-up in which the Republican candidate has an outright lead, albeit slim.
GOP Rep. Ashley Hinson leads Democratic nominee Josh Turek, a state representative, by an average 1.8%. The lead is substantially less than the double-digit margin President Donald Trump had in winning Iowa in 2024.
The seat is open because GOP Sen. Joni Ernst is not seeking reelection. Polymarket odds currently give Hinson a 66% chance of succeeding her.
Texas
The Lone Star State broke for Trump by roughly 14 points in 2024, erasing decades of slow Democratic gains in the Republican stronghold. But the 2026 Senate contest is a toss-up.
Democratic nominee state Rep. James Talarico currently holds a 2.4% average lead over Republican state Attorney General Ken Paxton.
Paxton has previously won multiple statewide races and even survived an impeachment attempt from members of his own party. But his longstanding feud with the establishment wing of the party appears poised to come back to haunt him.
The conservative firebrand beat out GOP Sen. John Cornyn in the party primary this year. While Cornyn placed first in the first round, he ultimately lost to Paxton in the runoff.
Paxton had offered to drop out of the race altogether if Cornyn could secure passage of the SAVE America Act, a marquee voter ID bill, though Cornyn could not do so. Trump cited the SAVE America Act issue when endorsing Paxton for the runoff.
With eight weeks until Election Day, Republicans have the tiebreaker advantage — but the path to holding the Senate runs through these seven razor-thin contests.
This is the closest it’s been in decades — “Historically close.”
CNN’s Harry Enten just broke down how narrow the midterm battle for control of the Senate really is.
“It’s LITERALLY 50/50!”
The races in Texas and Michigan could be absolutely crucial for Republicans looking to… https://t.co/UVLF1Bm0Ga pic.twitter.com/TxCcukKIFt
— Overton (@overton_news) September 8, 2026
