2026 Democratic nominee for US Senate in Maine?

Prediction market on manifold. 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.)

24h Volume: $1,527.592. Liquidity: $1,000. Resolves: 11/3/2026.