Maine Democrats hold their Senate primary on 9 June 2026, and the state uses ranked-choice voting. But the suspense drained out of this contest weeks ago. Gov. Janet Mills suspended her campaign on 30 April, citing a lack of money. That move left Platner without a well-known rival. The Democratic Senatorial Campaign Committee promptly called him the presumptive nominee.

Mills has not vanished from the ballot, though. She told the Portland Press Herald that she simply suspended active campaigning and remains listed. Even so, she is running no ads and holding no events. A third Democrat, David Costello, also appears on the ballot. So barring a shock, Platner wins Tuesday.

The winner faces Republican Susan Collins, who is running unopposed in her own primary. Collins is seeking a sixth term and chairs the Senate Appropriations Committee. A sixth win would make her Maine’s longest-serving senator. She is also the only Republican senator running in a state Kamala Harris carried in 2024. That fact makes Maine the Democratic committee’s top target, and the Cook Political Report rates the seat a toss-up.

Platner grew up in Blue Hill and farms oysters in Sullivan. After high school, he enlisted in the Marine Corps and served three tours in Iraq. Later he joined the Army National Guard and deployed once to Afghanistan. Between deployments, he earned a degree at George Washington University. He then tended bar, then worked as a defense contractor for the State Department. He launched his Senate campaign in August 2025 with a blunt pitch against billionaires and the political class.

Mills entered the race in October 2025, at 77, backed by Chuck Schumer and EMILY’s List. But Platner was already drawing big crowds and out-raising her. An Emerson College poll in March put him at 55 percent to her 28 percent among likely Democratic voters. First-quarter filings showed him with roughly $1.4 million more raised and about $1.7 million more in the bank. So her path narrowed fast.

On 30 April, one day before the state Democratic convention, Mills suspended her campaign. She said she had the fight to continue but not the money. That pattern sits at the center of what this site tracks. An organic veteran out-organized a recruited favorite. For the longer arc, revisit our profile of his campaign and our breakdown of the Platner versus Mills primary.

Even as the primary turned into a formality, the story grew harder for Platner. Three separate problems have piled up since last fall.

The first was a batch of old Reddit posts. They were crude, and some were ugly. A few made light of military sexual assault. Others used homophobic slurs. Platner apologized in a video and said he abhorred much of what he read back. The second was a chest tattoo from 2007. Reporters identified it as a totenkopf, the death’s-head image the Nazi SS adopted, and the Anti-Defamation League lists that exact design as a hate symbol. Platner said he picked it off a parlor wall while drunk on leave in Croatia and never knew the meaning. He had it covered.

The third is the most serious, and it broke in early June. The New York Times reported that three ex-girlfriends described toxic or volatile relationships. They alleged emotional abuse, heavy drinking, infidelity, and talk of rape as a show of dominance. One of them, Lyndsey Fifield, alleged physical intimidation. She said Platner grabbed her, once pulled her from a cab by the wrist, and twisted her arm while holding her in a room. She also said he had called the tattoo his own well before the controversy, which challenges his account.

Platner denied the core claims. In his first national interview, on MS NOW, he said anything alleging physical abuse was not true. He called the accounts politically motivated and noted that Republican groups have employed Fifield. He did own up to being a poor partner and to drinking heavily during what he called a dark period. His campaign said he strongly disputes the allegations. The accounts conflict, and the gravest ones are grave. Readers deserve to see that plainly.

So why did national Democrats stick with him through the spring? The general-election math is the honest answer. A UMass Lowell/YouGov poll fielded in late May put Platner at 48 percent. Collins drew 43 percent, with 6 percent undecided. The margin of error ran near five points. The gender gap was wide. Women favored Platner by 54 to 35 percent. Men leaned to Collins. Platner’s own favorability split almost even, while Collins sat underwater.

Now the caution, and it is a real one. That poll was mostly in the field before the Times report landed. The pollster also flagged that Platner is less known than Collins. Less name recognition cuts both ways. He has room to grow, but new information can move voters against him fast. Remember 2020. Collins trailed in nearly every public poll, then won by about nine points.

The party’s mood has soured since the report. Senators including Elissa Slotkin voiced concern, and Rep. Madeleine Dean said the allegations had disqualified him. Others held firm. Rep. Ro Khanna still campaigned with Platner, calling the described behavior wrong while crediting him for seeking redemption. Collins, for her part, called the allegations obviously troubling. The money will be enormous either way. The 2020 race set a state record near $200 million, and Republicans have already reserved more than $40 million in ad time to defend her.

Here the veteran thesis meets its limit, and we should be candid. A combat record helps a Democrat shrug off attacks on patriotism or toughness. It does not answer questions about how a candidate treated the people closest to him. Platner’s service bought him room to weather the early storm. These newest claims test something else, and a discharge paper cannot settle them.

For Platner, Tuesday is about the margin, not survival. He is expected to win the nomination comfortably. A late draft-Mills murmur did surface after the Times report. A handful of her supporters urged her back into the race. But she is out of money, there is no organized effort behind her, and she has shown no sign of returning. Her name on the ballot gives uneasy voters a place to land, yet nothing is pushing them there.

The real test comes next. Can a damaged but authentic populist veteran still beat Collins? Or have the allegations changed the math for good? The honest answer is that we will see. Either way, Maine stays at the center of the fight for the Senate. The party’s recent gains have leaned on veterans who can compete in hard terrain, a story we traced in the 2018 wave and again with this cycle’s women veterans running for the House. This race tests the model when the candidate, not the opponent, becomes the story.