2026 Senate Race — Colorado
Colorado Senate Race 2026: Lean D
John Hickenlooper (D) faces re-election in a D+10 state. Current rating: Lean D.
D+10
State Partisan Lean
Lean D
Race Rating
Race Details
| Incumbent | John Hickenlooper (D) |
| Challenger(s) | Joe O'Dea (R, possible) / others |
| Cook/Sabato Rating | Lean D |
| State Lean | D+10 |
Colorado Senate: The State's Partisan Shift, Election by Election
| Election | Democrat | Republican | Margin | Trend Signal |
|---|---|---|---|---|
| 2014 Senate | Mark Udall 46.2% | Cory Gardner 48.2% | R+2.0 | Still genuinely purple; national GOP wave helped Gardner |
| 2020 Senate | John Hickenlooper 53.5% | Cory Gardner 44.2% | D+9.3 | Denver suburbs had fully shifted D; college-educated migration from CA/IL accelerated the lean |
| 2022 Senate | Michael Bennet 55.9% | Joe O'Dea 41.1% | D+14.8 | Even in a wave year for R, Colorado stayed solidly D at statewide level |
| 2024 Presidential | Kamala Harris 55.8% | Donald Trump 41.7% | D+14.1 | Colorado's swing-state era effectively over; now solidly Lean D |
| 2026 Senate (projected) | Hickenlooper (incumbent) | TBD (Joe O'Dea possible rematch) | Lean D | O'Dea ran in 2022 as moderate — lost by 15 pts; unclear if stronger candidate emerges |
Race Analysis
Hickenlooper defeated incumbent Cory Gardner (R) in 2020 by 9 points. Colorado has shifted from purple to lean-D as Denver suburbs have grown and college-educated professionals displaced rural Republican margin. In 2026, with national headwinds for the party in power, Hickenlooper's seat is competitive. Cook rates it Lean D; RCP average shows D+4 to D+7.
State context: Colorado voted 55% Biden / 41% Trump in 2020. Senator: John Hickenlooper (D). Governor: Jared Polis (D).