The closely contested Maine Senate race between incumbent Republican Susan Collins and Democrat Troy Jackson, consistently polling within a few points, drives trader expectations for first-round turnout under ranked-choice voting. High competitiveness, substantial independent and unenrolled voter blocs, and crossover support from moderates are spurring intensive get-out-the-vote efforts by both campaigns ahead of early voting and the November 3 general election. Recent polling shows mixed enthusiasm levels, with Jackson backers expressing higher motivation in some surveys while Collins benefits from stronger name recognition and perceived effectiveness on state issues like appropriations. Historical midterm patterns in Maine, combined with procedural factors such as same-day registration and absentee options, support the market's clustering around 700,000–800,000 first-choice ballots, though shifts in crossover voting or late mobilization could widen the range.