Maine U.S. Senate S-ME-2026 · Class 2 · Regular cycle

Open in research → Editorial as of Apr 22 · FEC through Mar 31
General 2026-11-03
R Primary 2026-06-09
Filing Deadline 2026-03-15 (held)
Cook Political Report
Toss Up
As of Apr 13, 2026
Sabato's Crystal Ball
Toss Up
As of Mar 4, 2026
Polymarket
R 28¢
D 73¢
Refreshed today
D+4
Cook PVI
Incumbent
Susan Collins
Republican · Running
⚡ Market Divergence

Polymarket implies the Democrat has a 73% chance of winning the seat, while Cook and Sabato both rate this race Toss Up. Worth watching for either a rating movement or a market correction.

▸ Watch

Cook moved to Toss Up (Apr 13, 2026). Sabato: Toss Up (Mar 4, 2026). Gov. Janet Mills announced candidacy October 2025 but withdrew April 30, 2026, citing poor polling and fundraising. Jared Golden declined to run. D+4 PVI state.

Top contenders

Susan Collins
Republican
● Incumbent

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

FEC Receipts — Cycle Total
$10,463,304
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S6ME00159/
Graham Platner
Democrat
● Candidate

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

FEC Receipts — Cycle Total
$11,956,529
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S6ME00373/
12-wk spend
David Costello
Democrat
● Candidate

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

FEC Receipts — Cycle Total
$143,481
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S4ME00113/

Republicans

Susan Collins
Republican
● Incumbent

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

FEC Receipts — Cycle Total
$10,463,304
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S6ME00159/

Democrats

Graham Platner
Democrat
● Candidate

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

FEC Receipts — Cycle Total
$11,956,529
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S6ME00373/
12-wk spend
David Costello
Democrat
● Candidate

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

FEC Receipts — Cycle Total
$143,481
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S4ME00113/
Janet Trafton Mills
Democrat
● Filed with FEC

Federally registered candidate for the Maine U.S. Senate seat. No editorial profile available.

FEC Receipts — Cycle Total
$5,359,823
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S6ME00407/
12-wk spend
Jordan Wood
Democrat
● Filed with FEC

Federally registered candidate for the Maine U.S. Senate seat. No editorial profile available.

FEC Receipts — Cycle Total
$5,134,288
Through Mar 31, 2026
Source: FEC bulk data · api.open.fec.gov/v1/candidate/S6ME00332/
12-wk spend

Other parties

Tim Rich
Independent
● Candidate

Independent candidate for the Maine U.S. Senate seat.

FEC Receipts — Cycle Total
Not yet filed with FEC
Source: FEC bulk data · through 2026-03-31 (Q1 2026)

11 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.