| Alaska Senate election | Mary Peltola (D) leads: Mary Peltola 47%, Dan S. Sullivan 44%, Daniel J. Sullivan Jr. 4%, Gerald Heikes 1% · Data for Progress, fieldwork ended 2026-10-16 | Democratic lead · limited/uncertain |
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| Alabama Senate election | Barry Moore (R) leads: Barry Moore ≈50%, Everett Wess 35% · Cygnal, fieldwork ended 2026-10-17 | Republican lead · limited/uncertain |
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| Arkansas Senate election | Tom Cotton (R) leads: Tom Cotton 50%, Hallie Shoffner 41%, Jeff Wadlin 4.5% · Hendrix College / Talk Business & Politics, fieldwork ended 2026-10-13 | Republican lead · limited/uncertain |
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| Colorado Senate election | No verified September–October polling in this guide | Insufficient verified polling |
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| Delaware Senate election | No verified September–October polling in this guide | Insufficient verified polling |
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| Florida special Senate election (special) | Ashley Moody (R) leads: Ashley Moody 49%, Angie Nixon 45% · University of North Florida Public Opinion Research Lab, fieldwork ended 2026-10-19 | Republican lead · limited/uncertain |
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| Georgia Senate election | Jon Ossoff (D) leads: Jon Ossoff 48%, Mike Collins 40% · University of Georgia School of Public and International Affairs, fieldwork ended 2026-10-15 | Democratic lead · limited/uncertain |
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| Iowa Senate election | Ashley Hinson (R) leads: Ashley Hinson 47%, Josh Turek 45% · InsiderAdvantage, fieldwork ended 2026-10-22 | Republican lead · limited/uncertain |
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| Idaho Senate election | Jim Risch (R) leads: Jim Risch 49%, Todd Achilles 43% · VoteNexus Research, fieldwork ended 2026-10-22 | Republican lead · limited/uncertain |
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| Illinois Senate election | Juliana Stratton (D) leads: Juliana Stratton 58.5%, Don Tracy 41.5% · ActiVote, fieldwork ended 2026-10-20 | Democratic lead · limited/uncertain |
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| Kansas Senate election | Roger Marshall (R) leads: Roger Marshall 45.7%, Adam Hamilton 45%, David C. Graham 3% · RedBox Research, fieldwork ended 2026-10-23 | Republican lead · limited/uncertain |
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| Kentucky Senate election | No verified September–October polling in this guide | Insufficient verified polling |
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| Louisiana Senate election | OLDER POLL — not current: Julia Letlow (R) leads: Julia Letlow 48%, Jamie Davis 44% · Hart Research Associates, fieldwork ended 2026-09-19 | Republican lead · older poll |
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| Massachusetts Senate election | Ed Markey (D) leads: Ed Markey 60%, John Deaton 31.8%, Joe Tache 1.4%, Shiva Ayyadurai 0.8% · Suffolk University, fieldwork ended 2026-10-18 | Democratic lead · limited/uncertain |
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| Maine Senate election | Susan Collins (R) leads: Susan Collins 47%, Troy Jackson 46.5% · Trafalgar Group, fieldwork ended 2026-10-23 | Republican lead · limited/uncertain |
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| Michigan Senate election | Abdul El-Sayed (D) leads: Abdul El-Sayed 47%, Mike Rogers 46% · InsiderAdvantage, fieldwork ended 2026-10-22 | Democratic lead · limited/uncertain |
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| Minnesota Senate election | Peggy Flanagan (D) leads: Peggy Flanagan 48%, Michele Tafoya 45% · Rasmussen Reports / Pulse Opinion Research, fieldwork ended 2026-10-21 | Democratic lead · limited/uncertain |
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| Mississippi Senate election | No verified September–October polling in this guide | Insufficient verified polling |
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| Montana Senate election | Kurt Alme (R) leads: Kurt Alme 43.8%, Seth Bodnar 28.2%, Alani Bankhead 20.6%, Kyle Austin 1.7% · Quantus Insights, fieldwork ended 2026-10-18 | Republican lead · limited/uncertain |
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| North Carolina Senate election | Roy Cooper (D) leads: Roy Cooper 49.4%, Michael Whatley 39.1%, Shannon Bray 2.9%, Michael Dublin 1.9% · Harper Polling, fieldwork ended 2026-10-20; Roy Cooper (D) leads: Roy Cooper 56.9%, Michael Whatley 43.1% · ActiVote, fieldwork ended 2026-10-20 | Democratic lead · multiple clear polls |
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| Nebraska Senate election | Pete Ricketts (R) leads: Pete Ricketts 49%, Dan Osborn 47% · Impact Research, fieldwork ended 2026-10-20 | Republican lead · limited/uncertain |
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| New Hampshire Senate election | Chris Pappas (D) leads: Chris Pappas 50%, John E. Sununu 43% · Saint Anselm College Survey Center, fieldwork ended 2026-10-20 | Democratic lead · limited/uncertain |
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| New Jersey Senate election | No verified September–October polling in this guide | Insufficient verified polling |
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| New Mexico Senate election | OLDER POLL — not current: Ben Ray Luján (D) leads: Ben Ray Luján 53%, Larry Marker 37% · Research & Polling Inc., fieldwork ended 2026-10-09 | Democratic lead · older poll |
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| Ohio special Senate election (special) | Sherrod Brown (D) leads: Sherrod Brown 47%, Jon Husted 44% · InsiderAdvantage, fieldwork ended 2026-10-22 | Democratic lead · limited/uncertain |
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| Oklahoma Senate election | No verified September–October polling in this guide | Insufficient verified polling |
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| Oregon Senate election | No verified September–October polling in this guide | Insufficient verified polling |
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| Rhode Island Senate election | Jack Reed (D) leads: Jack Reed 59%, Raymond McKay 25%, Michael Bahry 7% · Emerson College Polling, fieldwork ended 2026-10-11 | Democratic lead · limited/uncertain |
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| South Carolina Senate election | Annie Andrews (D) leads: Annie Andrews 45%, Darline Graham 44%, Kasie Whitener 3%, Mark Hackett 2% · Impact Research, fieldwork ended 2026-10-21 | Democratic lead · limited/uncertain |
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| South Dakota Senate election | Mike Rounds (R) leads: Mike Rounds 50%, Brian Bengs 42% · Emerson College Polling, fieldwork ended 2026-10-21 | Republican lead · multiple clear polls |
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| Tennessee Senate election | No verified September–October polling in this guide | Insufficient verified polling |
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| Texas Senate election | James Talarico (D) leads: James Talarico 48%, Ken Paxton 46%, Ted Brown 1% · Emerson College Polling / Nexstar Media, fieldwork ended 2026-10-19; Tied: James Talarico 49%, Ken Paxton 49% · Beacon Research / Shaw & Company Research, fieldwork ended 2026-10-19 | Tied or conflicting latest polls |
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| Virginia Senate election | No verified September–October polling in this guide | Insufficient verified polling |
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| West Virginia Senate election | No verified September–October polling in this guide | Insufficient verified polling |
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| Wyoming Senate election | No verified September–October polling in this guide | Insufficient verified polling |
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