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Another Senator Backs Platner, Saying 'Democratic Party Needs to Win Back Working People'
New Mexico Sen. Martin Heinrich said the Mainer is "building a movement around folks who work hard for their family and community."
Mar 10, 2026
US Senate hopeful Graham Platner's momentum continues to grow, with yet another senator bucking the Democratic Party establishment to endorse him in Maine's June primary.
"Graham Platner is focused on delivering for Mainers, not billionaire donors,” said Sen. Martin Heinrich (D-NM) on Tuesday in comments reported by Politico. “And he’s exactly the person the Democratic Party needs to win back working people.”
Polls show Platner, the progressive 41-year-old Marine-turned-oyster farmer, comfortably ahead of Maine's centrist Democratic Gov. Janet Mills for the right to challenge the state's five-term Republican incumbent Sen. Susan Collins in November.
The seat will be an essential pickup if Democrats hope to retake the chamber in 2026.
Senate Minority Leader Chuck Schumer (D-NY) has pushed for Mills to get the nomination over Platner. This is despite polling last week from Quantus Insights, which showed Mills trailing Collins by over 1%, and Platne leading the Republican by more than 5% among likely voters.
Platner—a backer of Medicare for All and a billionaire wealth tax who has fiercely opposed aggressive US military interventions—first received the backing of Sen. Bernie Sanders (I-Vt.).
Earlier this month, Sen. Ruben Gallego (D-Ariz.) became the first Democratic senator to endorse Platner, in defiance of party leadership, calling him "the candidate that can win."
Heinrich, who has emphasized the necessity of making the Democratic Party a "bigger tent" and bringing in “new" and "younger" leadership, has admired Platner's candidacy from afar for months.
Responding to Platner's campaign launch video, in which he declared that "the enemy is the oligarchy," Heinrich wrote on social media in October, "We need more candidates like this."
New Mexico's three-term senator is now the third member of the chamber to endorse Platner, who said he was "honored" to have him as a "future colleague."
"He's building a movement around folks who work hard for their family and community—folks who deserve a Senator fighting in their corner," Heinrich said. "I’m proud to endorse and help send him to the Senate in November."
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Platner Holds 7-Point Lead Over Mills in Poll That Found Him Behind Just 3 Months Ago
The survey found Platner with a 33-point lead among independent voters.
Mar 04, 2026
The Pan Atlantic Research poll from December was something of an outlier survey in the Maine Senate race, finding that Democratic Gov. Janet Mills was leading progressive combat veteran Graham Platner by 10 points while a number of other polls at the time had Platner, a political newcomer, in the lead.
But on Wednesday, the research firm released its latest survey results after speaking with a random sampling of 1,120 Mainers again between February 13 and March 2. It found that respondents now more closely matched the findings of other polls, with Platner leading Mills by seven points ahead of the June Democratic primary.
Platner had the support of 46% of respondents, up nine points since December, while the governor polled at 39%, down eight points.
Voters ages 18-34 overwhelmingly support Platner, according to the new poll, with 61% backing him compared to 45% supporting Mills. Independent voters also expressed more support for the progressive candidate, by a 33-point margin.
Platner had more support among voters who earn less than $50,000 per year, with 43% supporting him and 41% backing Mills, and significantly more support among voters who make $100,000 per year or more, while Mills was one point ahead among middle-income voters.
The poll also asked respondents who they would support in the general election in potential matchups between the two Democratic candidates and Sen. Susan Collins (R-Maine). Collins and Mills were tied at 44% each, while Platner was ahead of the longtime Republican lawmaker by four points.
The survey also found that Platner—who has been holding packed campaign events across the state, supports Medicare for All and a billionaire minimum tax, and has loudly condemned the Trump administration's attacks on Venezuela and Iran—is the second-most popular politician in the state, after Sen. Angus King (I-Maine).
Pan Atlantic Research released the poll days after a University of New Hampshire survey found Platner ahead of Mills by 38 points in the primary and with an 11-point lead over Collins; Mills was found to be just one point ahead of the Republican.
Platner's support has steadily risen since he announced his candidacy last August. He was endorsed early on by US Sen. Bernie Sanders (I-Vt.) and has spoken out frequently against oligarchy, US support for Israel's assault on Gaza, Republican attacks on transgender rights, and President Donald Trump's deployment of US Immigration and Customs Enforcement agents in Maine and elsewhere.
Controversies that broke soon after Mills entered the race—at the behest of Senate Minority Leader Chuck Schumer (D-NY)—regarding a tattoo Platner had that resembled a Nazi symbol and posts he had written on Reddit years ago, have done little to dent the candidate's lead in polls.
Earlier this week he won his second endorsement from a US senator when Sen. Ruben Gallego (D-Ariz.) announced his support, and as the latest poll was released Wednesday, Democratic Maine gubernatorial candidate Troy Jackson offered his endorsement.
"I'm sick to death of the establishment telling us what we have to do," said Jackson, who has also been endorsed by Sanders. "And until we elect people like Graham Platner up and down this state, up and down this country, we're never going to change it."
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New Poll Shows Platner Romping in Dem Primary and Comfortably Ahead of Collins for Maine Senate Seat
"Platner stomping Mills in the primary, then cruising to a double-digit win in the general election... wouldn’t just be a Senate-seat victory but a narrative earthquake," said one writer.
Feb 24, 2026
The progressive candidate Graham Platner has a commanding lead in the Democratic primary for Maine's US Senate seat over the state's centrist Gov. Janet Mills. Come November, he's also much more likely than Mills to defeat the Republican incumbent, Sen. Susan Collins.
The University of New Hampshire's Pine Tree State Poll, released Tuesday morning, showed that Platner has built momentum since October. Five months ago, 58% of likely Democratic voters said the 41-year-old oyster farmer was their first choice to be the state's next senator, compared with 24% who preferred the governor.
Now, with the June primary less than four months away, undecided voters have broken hard in Platner's favor: 64% said he’s their first choice, while Mills has only jumped up to 26%.
It's perhaps an unsurprising result, as Democratic voters overwhelmingly support the kind of economically populist anti-oligarchy politics that Platner—a proponent of Medicare for All and a federal billionaires' tax, with backing from labor unions and Sen. Bernie Sanders (I-Vt.)—has unapologetically championed.
But Tuesday's poll suggests his message is not only resonating with Democrats. Where a race between Mills and Collins has the Democrat leading by a single point, within the margin of error, Platner would be expected to win the general election comfortably with 49% of the vote to just 38% for Collins.
The steady shift toward Platner comes as affordability issues have become increasingly salient to Maine voters. A full 35% of voters said that either the cost of living or housing was the most important problem facing Maine.
As President Donald Trump suffers historic unpopularity amid a flailing economy, the most marked shift has been concern about the cost of living. Where just 4% of Mainers said it was their No. 1 issue in March 2025, that number has shot up to 20% this month.
Collins' popularity has been in a dramatic freefall in the era of Trump 2.0, to the point where a late January Morning Consult poll showed her to be the second-least popular US senator, behind only the former longtime GOP leader, Sen. Mitch McConnell (R-Ky.).
While Democratic Party insiders have long argued that voters prefer a safer, moderate candidate when ousting a hated incumbent, observers say Platner's success over the candidate backed by Senate Minority Leader Chuck Schumer (D-NY) and much of the party establishment is redefining what it means to be "electable" in a swing state.
"The fatal part of this poll for Mills isn’t even the massive lead Platner has," said Drop Site News co-founder Ryan Grim. "It’s that he is 10 points more electable against Collins, which is the real priority for Maine voters who don’t want her in office anymore."
New York Times columnist David Wallace-Wells said: "This is a small-sample poll, and there’s a long way to go. But if something like this comes to pass—Platner stomping Mills in the primary, then cruising to a double-digit win in the general election—it wouldn’t just be a Senate-seat victory but a narrative earthquake."
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