The finance director for Graham Platner’s Senate campaign announced his resignation on Friday, the latest in a series of personnel departures for the Maine hopeful’s high-profile bid that has been marred by controversies over old social media posts and his tattoo with Nazi connotations.

Ronald Holmes, who had served as Platner’s national finance director since August, announced in a post on LinkedIn that he’s leaving the operation. He follows campaign manager Kevin Brown, who stepped down after less than a week on the job citing family reasons, and political director Genevieve McDonald, who resigned in a fiery fashion earlier this month, saying she could not look past some of Platner’s previous Reddit posts, where he self-identified as a communist and downplayed sexual assault in the military.

“I joined this campaign because I believed in building something different — a campaign of fresh energy, integrity, and reform-minded thinking in a political system that often resists exactly those things,” said Holmes in his post on Friday. “Somewhere along the way, I began to feel that my professional standards as a campaign professional no longer fully aligned with those of the campaign.”

Holmes did not immediately respond to messages Friday morning. His previous work included the campaigns of Michigan Democratic gubernatorial hopeful Chris Swanson and Rep. Josh Riley.

Platner’s campaign was off to a hot fundraising start, raising more than $3.2 million in his first six weeks as a candidate, largely from small-dollar donors.

In a statement, a campaign spokesperson pointed to the campaign’s focus on those small donors and said fundraising efforts will continue.

“Ron helped the campaign reach out to big dollar donors, and we appreciated his efforts. But the reality is our campaign’s fundraising success has come largely from small dollar donors,” said the spokesperson. “Nearly 90 percent of what we’ve raised has come from small dollar donations and online donors, which has been and [continues] to be run by our digital fundraising director.”

Platner, who went from an unknown oysterman to a high-profile Senate candidate endorsed by Sen. Bernie Sanders (I-Vt.) in just a few weeks, apologized for his controversial Reddit posts and covered up his tattoo, saying he only learned after launching his campaign that it could be a Nazi symbol.

He has continued to campaign in recent weeks despite the controversies, holding town halls across the state. His campaign launched an ad this week urging voters to reject a voter-identification measure on Maine’s ballot this November.

Recent polls, though wildly different from one another, have shown Platner as a strong candidate in the Democratic primary that also includes Gov. Janet Mills — who is national Democrats’ preferred candidate in the race — along with a handful of other contenders including former congressional staffer Jordan Wood.