Former Maine state Senate President Troy Jackson is on the verge of becoming the Democratic nominee in one of the party’s most closely watched Senate races. The contest in Maine is being framed as a must-win battle for Democrats, putting added focus on Jackson as the general election approaches.

With 101 days until Election Day, the race is entering a compressed and high-stakes stretch. A nomination would move Jackson from the intraparty phase into a broader statewide campaign in a contest expected to draw national attention.

The Maine Senate race matters beyond the state because it is seen as important to the balance of power in Washington. That larger political backdrop is likely to keep outside interest, media coverage and party resources centered on Maine through the final months of the campaign.

Jackson’s expected nomination gives Democrats a prominent figure to carry their message in the state during the closing push. As the calendar shortens, Maine is shaping up as one of the key Senate races to watch before voters head to the polls.