Colorado U.S. Senate S-CO-2026 · Class 2 · Regular cycle

Open in research → Editorial as of Apr 22 · FEC through Mar 31
General 2026-11-03
R Primary 2026-06-30 (held)
Filing Deadline 2026-03-18 (held)
Cook Political Report
Solid D
As of date pending
Sabato's Crystal Ball
Safe D
As of date pending
Polymarket
R 9¢
D 92¢
Refreshed today
D+6
Cook PVI
Incumbent
John Hickenlooper
Democrat · Running
▸ Watch

Hickenlooper said this will be his last term. Progressive state senator Julie Gonzales challenging him in the primary. Baisley emerged as presumptive GOP nominee from April 11, 2026 CO Republican Assembly. D+6 PVI.

Top contenders

Mark Baisley
Republican
● Candidate

Republican candidate for the Colorado U.S. Senate seat.

FEC Receipts — Cycle Total
$31,866
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S6CO00507/
12-wk spend
John Hickenlooper
Democrat
● Incumbent

Democrat candidate for the Colorado U.S. Senate seat.

FEC Receipts — Cycle Total
$6,818,283
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S0CO00575/
12-wk spend
Julie Gonzales
Democrat
● Candidate

Democrat candidate for the Colorado U.S. Senate seat.

FEC Receipts — Cycle Total
$443,495
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S6CO00499/
12-wk spend

Republicans

Mark Baisley
Republican
● Candidate

Republican candidate for the Colorado U.S. Senate seat.

FEC Receipts — Cycle Total
$31,866
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S6CO00507/
12-wk spend

Democrats

John Hickenlooper
Democrat
● Incumbent

Democrat candidate for the Colorado U.S. Senate seat.

FEC Receipts — Cycle Total
$6,818,283
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S0CO00575/
12-wk spend
Julie Gonzales
Democrat
● Candidate

Democrat candidate for the Colorado U.S. Senate seat.

FEC Receipts — Cycle Total
$443,495
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S6CO00499/
12-wk spend

16 additional FEC filers excluded as long-tail (no editorial listing, not the seat incumbent, and under $1M raised). They remain in the database and can be surfaced via the FEC API directly.