The Warren boomlet appears to have legs. Recent polling suggests the Massachusetts senator has pulled ahead of Bernie Sanders in Nevada, California, Minnesota, and South Carolina, potentially cementing her position in second place behind Joe Biden in the Democratic primary race. Quinnipiac finds that Warren would beat Donald Trump nationally by seven points; Fox News finds that she would beat the president by two.

It’s a notable reversal of fortune, after a slow start for Elizabeth Warren’s campaign, and one that has surprised some Democratic rivals. “You’re seeing a candidate who actually came into the race with theory of how she wanted to run, and she’s executed,” a top Democratic strategist who supports Sanders recently told my colleague Chris Smith. “She looked dead in the water at the start of the year. Now she’s in position to seize the nomination.” Sanders, meanwhile, has stalled in national polls, and has ceded political ground to his left. “His candidacy this time around has ended up being a greatest-hits act. What new energy or idea is he bringing to the table? Warren has outmaneuvered him on policy.”

Advisers and allies of Biden, still far and away the front-runner, have also taken notice. “Biden’s people are worried about her rise, and feel they caught a break in not having to face her in the first debate,” report Mike Allen and Jim VandeHei in Axios. One Biden source notes that Warren is largely drawing support from Sanders’s camp, and that Warren’s appeal will be limited with the broader, more moderate swath of the electorate backing Biden. Still, Bidenworld fears Warren’s influence. “Even if she tops out, her politics are much closer to Bernie Sanders or Kamala Harris,” Allen and VandeHei write, “so she could help lift another candidate over Biden with her endorsement and support.”

Trump, who reportedly thought he had neutralized Warren over DNA-gate last year, is also recalibrating his expectations. Politico reports that the Trump campaign, which had essentially left Warren for dead, now views her clear policy vision and populist appeal as a real threat. “We have to make sure voters know about her proposals for government takeover of health care, free health care for illegal immigrants, radical environmental restrictions, and increased taxes—all proposals that will devastate this country,” said Tim Murtaugh, a Trump 2020 spokesman. As a sign that it sees her as a serious threat, the president’s campaign has begun to push anti-Warren messages in battleground states, and to employ a litany of opposition-research dark arts, including sending trackers with cameras to Warren’s rallies, hiring researchers to dig into her past, and endless message testing—a sign that “Pocahontas” isn’t going to cut it. (Not that Trump intends to drop the nickname. “Now I see that Pocahontas is doing better. I would love to run against her, frankly,” he told Fox News last week.)

Trump allies may have real reason to worry about Warren’s appeal to swing voters. Her platform has been endorsed, in theory, by Fox News host Tucker Carlson, who praised her “economic patriotism” and argued that her fiery rhetoric on banks and income inequality sounds like “Donald Trump at his best.” Outside the Fox-Republican Party nexus, she’s completed several successful campaign visits to Trump-voting strongholds, where voters admit that while they’re inherently wary of Democrats, they find her genuine and committed to addressing their pet issues of economic inequality and declining opportunities. It’s the sort of message that landed Trump in the White House, but this time executed by a politician with the wherewithal—and the detailed plans—to make good on her promises.