Former Maine Senate President Troy Jackson appears to be sprinting far ahead of his rivals in the abbreviated race to replace now ex-candidate Graham Platner as the Democratic Senate nominee in the high-stakes showdown to face off with longtime Republican Sen. Susan Collins.

Delegates aligned with Jackson won the vast majority of the 319 slots that were up for grabs on Saturday as Maine’s 16 counties kicked off two days of delegate selection for next weekend’s nominating convention.

“We’re well on our way to getting the government that we deserve,” Jackson emphasized Saturday night in a video posted to social media, as he addressed supporters. “From the bottom of my heart, thank you.”

Jackson is now in a strong position to secure the nomination and face off in the midterm elections against Collins in what’s expected to be a combative and expensive ballot box battle that’s among a dozen nationwide which will determine if the Democrats can win back the Senate majority. The GOP currently holds the chamber 53-47.

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A fifth-generation logger and a one-time conservative Republican who became a Democrat over two decades ago, Jackson came in third place last month in Maine’s Democratic gubernatorial primary.

On Saturday, in the race to replace Platner, Jackson-aligned delegates won more than 90% of the slots, including all 149 in Cumberland County, Maine’s most populous county and home to the state’s largest city, Portland.

Along with Platner, Jackson had the support of progressive champion Sen. Bernie Sanders of Vermont as he ran for governor, and he is currently backed by ‘Our Revolution,’ the group born in 2016 out of Sanders’ first presidential campaign.

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Jackson, similar to Platner, is running on a progressive and populist platform aimed at working-class voters. He backs raising taxes on billionaires, the universal healthcare system known as “Medicare-for-all,” abolishing U.S. Immigration and Customs Enforcement, and he opposes military aid to Israel at a time that Democrats are increasingly divided on support for America’s longtime Middle East ally.

Nirav Shah, a former director the Maine Center for Disease Control and Prevention from 2019 to 2023 who later served as principal deputy director of the federal CDC during then-President Joe Biden’s administration, and who came in second in last month’s Democratic gubernatorial primary, secured only a handful of delegates on Saturday.

Shenna Bellows, Maine’s secretary of state, who came in fourth place in the race for the Democratic gubernatorial nomination, was even further back in the delegate hunt, as was Jordan Wood, a former congressional staffer for then-Rep. Katie Porter of California who unsuccessfully ran for the Senate as well as the Democratic nomination in the state’s 2nd Congressional District this cycle.

Maine’s eight remaining counties will select 181 delegates on Sunday. The 500 picked this weekend will join 101 delegates coming automatically from the Democratic State Committee. All 601 will vote for the Senate nominee at next Saturday’s convention in Bangor.

Platner, a combat veteran and oyster farmer who was backed by Sanders soon after he launched his bid last August, saw his campaign quickly catch fire. Two-term Democratic Gov. Janet Mills, who was heavily recruited by longtime Democratic Senate leader Sen. Chuck Schumer to run for the Senate, suspended her campaign this spring after trailing Platner in fundraising and in the polls.

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But even as Platner steamrolled the Democratic establishment and crushed the competition last month to capture the nomination, he had already been forced on defense in the wake of a slew of scandals.

Platner dropped out earlier this month, amid calls from top Democrats in Maine and across the country to immediately exit the race following an explosive report containing an allegation of rape from a woman he previously dated. Platner denied the report but stepped aside.

While Jackson was among those who quickly called on Platner to end his bid in the wake of the rape allegation, he had previously campaigned alongside Platner and made the case that he was the best candidate to continue the fight for the progressive and populist agenda.

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“This movement is always been bigger than one person. It’s about taking on a system rigged against working people, fighting for ‘Medicare-for-all,’ strong unions, higher wages, reproductive freedom, and an economy where billionaires and corporations finally pay their fair share,” Jackson said last week during a Our Revolution virtual town hall, as he pointed to Platner supporters.

At last week’s first debate among the replacement candidates, Jackson pointed to Platner and said, “That’s the thing that I think Graham did the best: talked about fighting against the health care industry and the prescription drug industry to make sure that people in this state and this country have affordable, quality health care.”