Maine Democrats gather in Bangor on Saturday to formally nominate a new U.S. Senate candidate, replacing Graham Platner after the initial nominee ended his campaign earlier this month following a rape allegation. NPR

Platner won the June 9 Democratic primary, according to the Associated Press. He suspended his campaign in early July after a woman he had previously dated accused him of raping her in 2021. Democratic Party leaders called on him to withdraw as the nominee on July 6, Reuters reported. Platner has denied the allegation.

The race to replace him on the ballot drew a sprawling field. By July 9, five candidates had declared, each positioning themselves as the best standard-bearer of Platner's outsider mantle, according to Reuters. A debate on July 16 included nine declared candidates on stage after the hosting station agreed to expand the field. By the time Democrats convene this weekend, nearly every rival has dropped out, and three candidates remained as of the convention: Troy Jackson, Saundra Pelletier, and David Costello, according to WMTW.

Jackson, a fifth-generation logger from northern Maine and former president of the Maine Senate, enters the convention as the apparent front-runner. He dominated delegate-selection meetings in half of Maine's counties on July 18, Maine Public reported. Reuters reported on July 19 that Jackson had gained majority delegate support, effectively securing the nomination to challenge Republican Senator Susan Collins. Shenna Bellows, another contender, dropped out the same day.

Jackson's platform places him on the left flank of the party: Medicare for All, tax increases on the ultra-wealthy and large corporations, abolishing ICE, ending U.S. military aid to Israel, passing LGBTQ civil rights legislation, and federalizing the right to an abortion. He previously held more conservative positions on LGBTQ rights and abortion before changing his views.

State Senator Stacy Brenner, a farmer and nurse who supports Jackson, described his evolution on those issues as compelling. The Washington Post and CNN have reported that Jackson exhibited a short temper with colleagues during his time in office.

The Maine Democratic Party's website at mainedems.org features a "Senate Nominating Convention Countdown" timer and a link to "FINAL DELEGATE RESULTS." The party published a "County Delegate Guide" PDF on July 16 explaining how delegates participate in the nominating convention.

Democrats need to net four seats to win back control of the U.S. Senate in the 2026 election. The Maine seat, held by Collins, is part of the national map Democrats are targeting. Collins, first elected in 1996, has not been a swing-state Democrat's easiest target, but the party's path to a majority runs through races like this one.

The convention process itself is a consequence of Maine's ballot-access rules. With Platner having won the primary, the party cannot simply install a replacement. It must hold a nominating convention where delegates selected at municipal and county caucuses cast votes, making the July 18 county meetings a decisive step in consolidating Jackson's lead before the formal vote in Bangor.

The nominee will face Collins in November. Republicans hold a 53-seat majority in the Senate. A Democratic takeover requires flipping four seats while defending every incumbent of their own, a margin that leaves little room for a misstep in any single race.