A new political action committee is spending money to boost State Auditor Matt Dunlap and attack state Sen. Joe Baldacci in Maine’s 2nd District race.

The odd effort to intervene in the race between several Democrats hoping to succeed U.S. Rep. Jared Golden, D-Maine, comes from Real Change PAC, which registered May 11 on the Federal Election Commission website with an address in Fremont, Nebraska, and a treasurer named “Nathan Letourneau.”

It reported spending more than $300,000 so far in the 2nd District race, per federal campaign finance records, with about $241,000 going to “media placement / media production” that supports Dunlap, a former secretary of state from Old Town. It’s spent roughly $60,000 to oppose Baldacci, a state senator and former city council member from Bangor.

The group won’t face a deadline to disclose funders until weeks after the June 9 primary.

The tactics in Maine mirror a shadow campaign underway in other states to meddle in Democratic primaries. Democrats insist the tough-to-trace groups are ultimately linked to Republicans, but there are few public records available for now to prove that. The mysterious spending in Democratic races has also happened recently in House primaries in states such as Texas, California and Pennsylvania.

Real Change PAC is also getting involved in a primary in New Jersey in what looks like a move to ultimately help U.S. Rep. Thomas Kean, who has been absent from Congress for weeks with an undisclosed illness.

The Maine activity could be the latest example of an old campaign tactic in which one party seeks to boost a candidate in the opposing party’s primary who is viewed as more beatable or vulnerable come the general election.

The 2nd District primary has already seen a bit of intraparty squabbling over who is best suited to face former Gov. Paul LePage in November. Baldacci received an endorsement earlier this month from the national House Democratic campaign arm. Dunlap and the two other Democratic candidates, ex-Capitol Hill staffer Jordan Wood and social worker Paige Loud, were not happy and wrote a joint letter to Baldacci asking him to disavow the more than $200,000 that a Democratic super PAC based in Washington, D.C., started spending to run pro-Baldacci ads.

PACs are legally barred from coordinating with candidates, and Dunlap has also benefited from outside spending in the form of the National Nurses United PAC spending money on mailers that promote him.

While Baldacci led a 2nd District poll from Pan Atlantic Research earlier this month, the latest University of New Hampshire poll released Wednesday found 23% of voters prefer Wood as their first choice, 22% pick Baldacci, 17% back Dunlap and 14% support Loud.

Efforts to reach Real Change PAC were unsuccessful. It has a Gmail address that doesn’t work and a treasurer with no clear political history or easy-to-identify footprint.

The money it has set aside for the 2nd District was paid to a similarly murky consulting firm with a Jacksonville Beach, Florida, address. On its website, which does not have much content, Real Change PAC says it is “dedicated to electing grassroots candidates who are committed to progressive values.”

“We will only get real change in Washington if we defeat the failed Democratic establishment and billionaire special interests that control our politics,” the website says.

The Baldacci campaign, however, said Republicans are behind the effort to support Dunlap so LePage doesn’t have to face Baldacci in November.

“Washington Republicans know Joe Baldacci is the one candidate who can beat Paul LePage and hold Trump accountable, so they are propping up Matt Dunlap with hundreds of thousands of dollars in support from a dark money, MAGA-connected super PAC,” said Jared Bornstein, the Baldacci campaign’s chief adviser.

Dunlap said in a statement Wednesday that he does “not want super PAC support in this primary” and reiterated his call for Baldacci to reject money from outside groups.

“I am calling on every group spending in this race to stop today,” Dunlap said. “The people of Maine should decide this race, not billionaires, not outside groups.”