The fight for Congress

Republican Sen. Roger Marshall, who won his Aug. 4 primary with 79.9%, faces Democrat Adam Hamilton, a pastor and founder of the Church of the Resurrection, and Libertarian David C. Graham. As of October 2026, Cook Political Report and Sabato's Crystal Ball rate the race a Toss-up, while Inside Elections rates it Likely R.

Republican incumbent Pete Ricketts, seeking his first full term after winning a 2024 special election, won his primary with about 82%. The competitive dynamic is independent Dan Osborn, who qualified for the ballot by petition and polls close to Ricketts; Democratic primary winner Cindy Burbank has pledged to drop out to consolidate support behind Osborn. Rated Likely R.

Sen. Lindsey Graham won the June 9 Republican primary but died in July 2026, and Gov. Henry McMaster appointed his sister, Darline Graham, to the seat. Darline Graham led the Aug. 11 special Republican primary and won the Aug. 25 runoff over Rep. Ralph Norman with about 52.5%. She faces Democratic pediatrician Annie Andrews on Nov. 3.

Open seat as GOP Sen. Tommy Tuberville runs for governor; Rep. Barry Moore won the June 16 Republican runoff to face Democrat Everett Wess.

GOP incumbent Tom Cotton easily won renomination for a third term; Democrat Hallie Shoffner won her primary in a state Democrats have not carried for Senate since 2008.

Democratic incumbent John Hickenlooper won a contested primary for a second term and faces Republican state senator Mark Baisley.

Democratic Sen. Chris Coons, seeking a third full term, won the Sept. 15 primary with about 78%. He faces Republican Michael Katz, a physician and former Democratic state senator who defeated retired Army Col. John Shulli for the GOP nomination.

Special election for the final two years of Marco Rubio's term, which he left to become Secretary of State. Appointed Republican Sen. Ashley Moody won the GOP nomination against minimal opposition, and Angie Nixon won the Aug. 18 Democratic primary with 56.1%.

GOP incumbent Jim Risch won renomination for a fourth term; Democrat David Roth advanced in a state Democrats have not won for Senate since 1974.

Open seat with Sen. Dick Durbin retiring; Lt. Gov. Juliana Stratton won a competitive Democratic primary over Reps. Krishnamoorthi and Kelly, and faces Republican Don Tracy.

Open seat with Sen. Mitch McConnell retiring; Trump-backed Rep. Andy Barr won the GOP primary and faces Democrat Charles Booker.

GOP incumbent Bill Cassidy was denied renomination under Louisiana's new partisan-primary system; Rep. Julia Letlow won the June 27 runoff and faces Democrat Jamie Davis.

Democratic Sen. Ed Markey, seeking a third full term, defeated Rep. Seth Moulton in the Sept. 1 primary, about 64.7% to 35.0%. He faces Republican John Deaton, who was unopposed for the GOP nomination.

GOP incumbent Cindy Hyde-Smith won renomination; Democrat Scott Colom advanced in a state Democrats have not won for Senate since 1982.

Open seat after GOP Sen. Steve Daines withdrew before the filing deadline; former U.S. Attorney Kurt Alme won the GOP primary, with Democrat Alani Bankhead and Tester-backed independent Seth Bodnar also on the ballot.

Democratic incumbent Cory Booker, who ran unopposed in his primary, is strongly favored to win a third full term against Republican nominee Justin Murphy in this heavily Democratic state.

Democratic incumbent Ben Ray Lujan won his primary with 84.2% and is heavily favored for reelection against Republican write-in nominee Larry Marker in this reliably Democratic state.

Gov. Kevin Stitt appointed Williams Companies executive Alan Armstrong to the seat in March 2026 after Markwayne Mullin resigned to lead the Department of Homeland Security, and state law bars Armstrong from seeking the full term. U.S. Rep. Kevin Hern won the June 16 Republican primary with 69.8%, and nurse N'Kiyla Jasmine Thomas won the Aug. 25 Democratic runoff with 61.2%.

Democratic incumbent Jeff Merkley won his primary with 93.2% and is heavily favored to win a fourth term against Republican state senator David Brock Smith in this reliably blue state.

Democratic Sen. Jack Reed, seeking a sixth term, won the Sept. 9 primary over Connor Burbridge and Luis Daniel Muñoz. He faces Republican Raymond McKay, who was unopposed in his primary.

Republican incumbent Mike Rounds won his primary with 75.8% and is heavily favored to win a third term against Democrat Julian Beaudion and independent Brian Bengs.

Republican Sen. Bill Hagerty, unopposed in the Aug. 6 primary, seeks a second term. Democrat Marquita Bradshaw, the party's 2020 nominee, won the Democratic primary with 54.8%.

Democratic Sen. Mark Warner, unopposed in the Aug. 4 primary, seeks a fourth term. Republican Bert Mizusawa won the GOP primary with 51.5% over David Williams and Kim Farington.

Republican incumbent Shelley Moore Capito won her primary with 66.5% and is heavily favored to win reelection against Democrat Rachel Fetty Anderson in this deeply Republican state.

With Republican Sen. Cynthia Lummis retiring, Rep. Harriet Hageman won the Aug. 18 Republican primary for the open seat with 64.9%. James Byrd won the Democratic primary with 79.3%.