2026 Democratic nominee for US Senate in Maine?

Question

Susan Collins (R-ME) is up for reelection in 2026. Which Democrat will face her?

(Feel free to suggest additions, though I'll only add people who I subjectively think have a >2% chance of winning.)

Update 2026-06-04 (PST) (AI summary of creator comment): This market will resolve based on whoever appears on the November ballot, not the primary election result. This accounts for potential candidate replacements after the July deadline.

Update 2026-06-04 (PST) (AI summary of creator comment): This market will resolve based on whoever appears on the November ballot as the Democratic nominee, not necessarily the primary election winner. If a candidate wins the primary but withdraws and is replaced, the market resolves based on who is actually on the November ballot.

Manifold Markets · Answer

Per Manifold Markets prediction market, Graham Platner, followed by Other and Janet Mills are most likely. See the market for live updates (130 traders, as of Jun 13, 2026).