“This seat was by far the most competitive seat in Michigan — it was one that, with a normy, generic Democrat, would have almost been impossible for Barrett to hold, based on the national trends,” he said.

Some of that sentiment had been shared with elected Democrats, who expressed concern about Lawrence’s ability to win a general election.

The National Republican Congressional Committee also took a victory lap Tuesday night, claiming that the “Democrats’ path to the House majority is evaporating in real time.”

But even as some Republicans breathe a sigh of relief, Rep. Tom Barrett (R-MI) is taking a more cautious approach to his matchup against Lawrence. Barrett won his race by about 4 percentage points in 2024, with President Donald Trump carrying the seat by just 1 point.

“I can tell you we will not underestimate him,” Barrett told the Washington Examiner. “He’s a radical, big government socialist but we will be taking this race very seriously all the way to the finish line.”

While Democrats have rallied behind Lawrence, with the Democratic Congressional Campaign Committee and House Majority PAC now supporting him, many in the party are wary about the resources it will take to elect a progressive in a battleground.

“MI-07 was always going to be an expensive race, but William Lawrence’s nomination definitely increased the cost of competing,” a Democratic operative told the Washington Examiner. “In a state where House Democrats are already competing with expensive Senate and Gubernatorial races for finite advertising inventory, Lawrence’s candidacy only raises the amount of work—and likely the amount of money—it will take to beat Tom Barrett.

“Candidates from the progressive wing might eke it over the finish line in deep-blue districts, but they don’t have a good track record in true battlegrounds like MI-07, where general election voters are substantially different from primary electorates,” they said. “This isn’t New York City—it’s one of the most competitive House districts in the country.”

Lawrence, a founder of the climate activist group Sunrise Movement, will face more of an uphill battle to win due to his ties to the Democratic Socialists of America, although he is not endorsed by the organization and said he let his membership lapse last month during an interview with CNN on Wednesday.

“If democratic socialism is believing that everybody deserves a good job and a good home and we should have healthcare that covers us for life, then, yeah, you can call me a democratic socialist or whatever you want,” Lawrence told a local radio outlet earlier this year.

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The DCCC did not back a candidate in this race, but national Democrats made clear they preferred Brink or Maasdam over Lawrence. Many Democratic operators familiar with the race, however, told the Washington Examiner they were not surprised by the result, saying Lawrence’s surge had been evident in the weeks leading up to the primary.

On Wednesday, House Minority Leader Hakeem Jeffries congratulated Lawrence on his victory. “Thank you Leader Jeffries. I look forward to fighting alongside you to defeat Tom Barrett, take back the House, and stop Trump’s extreme and costly agenda,” Lawrence responded.

David Sivak contributed to this article.