Tuesday's primary results weren't just a bad night for the Democratic establishment. They were a warning shot that the party's socialist insurgency has arrived, is organized, and intends to win. And the problem for them is that they have no idea what to do about it, which could spark a civil war within the party.

The Democratic Socialists of America have been running their own long game inside the Democratic Party for years. Now DSA NYC co-chair Gustavo Gordillo is willing to say the quiet part out loud. The DSA runs candidates on the Democratic ballot line, wins primaries, and places members inside Democratic caucuses. The difference is that they don't answer to the party apparatus or its donor class.

"Our candidates run as Democrats," Gordillo said. "We're on the Democratic Party ballot line. We contest the primaries, and when they're in the legislature, they're part of the Democratic Party caucus. But we don't agree with the way the Democratic Party establishment organizes or runs its party apparatus."

Gordillo identified a contradiction at the core of the party's identity. "There's a problem in the Democratic Party where they are funded by billionaire donors and at the same time they're trying to represent the working class," he said. "And in our opinion you have to choose between the billionaire class and the working class. It's just impossible to satisfy all of them."

Establishment Democrats aren't happy about this. "If you hate the Democratic Party, then please don't run for our nomination," former DNC Chairman Jaime Harrison said in a post on X. "Don't use our resources. Don't rely on our volunteers. Don't use our infrastructure. Don't ask Democrats to invest their time, money, and energy in your campaign."

Harrison argued that the Democratic Socialists of America should focus on "building the party you actually support."

Others are clearly concerned that the rise of DSA-linked candidates will hurt the Democratic Party.

"All of us are a little frustrated with the Democratic Party. But you don't blow it up," New York Attorney General Letitia James said.

House Minority Leader Hakeem Jeffries and Senate Minority Leader Chuck Schumer, both of whom represent New York, were unable to stop what happened, and now both are in serious political trouble. Jeffries was lucky in that Mamdani steered the DSA away from running a primary challenger against him. However, he may not be spared in a future election. Supporters of Tuesday's victorious socialist candidates made the long-term stakes clear, chanting "you're next" in reference to Jeffries after Tuesday's victories.

Even moderates within the party are running out of patience and pinning the blame on the party leadership. Sen. Elissa Slotkin (D-Mich.), considered a more moderate Democrat, suggested Thursday that both Jeffries and Schumer may need to step aside, framing the problem in terms that should embarrass both men. "To me, the lesson was simple. Democrats had too many priorities. They tried to make everyone happy and answer every question. When you prioritize everything, no one knows what you actually stand for," Slotkin told Stephen A. Smith on SiriusXM's "Straight Shooter with Stephen A."

She contrasted that with Donald Trump's 2024 approach. "He said, 'I'm going to make your life more affordable. I'm going to put more money in your pocket.' ... He won because he kept his message simple and focused on the issue Americans cared most about."

A year and a half after the 2024 election, the party still hasn't settled on a direction. "That's why I believe we need significant new leadership," Slotkin said. "The old models are no longer working, and that includes the Democratic Party."

Sure enough, Politico reports that moderate Democrats are "sounding the alarm after massive losses in New York's primaries."

The far left is eyeing even bigger targets in key battleground primaries that will determine control of Congress as well as governorships in crucial swing states. Most immediately, moderates fear that a progressive primary sweep could imperil the party's hopes of beating Republicans this fall.

They also have a more fundamental fear: that progressives are becoming more mainstream as they keep winning - reshaping the Democratic Party.

The socialists are winning this civil war, and they're just getting started. Colorado Democrats head into their own primaries carrying the same internal contradictions. Democratic Socialist Melat Kiros is challenging longtime incumbent Diana DeGette in a district the establishment considers safely theirs. In the 8th District, progressive-aligned Manny Rutinel faces establishment-backed Shannon Bird, with the winner eventually squaring off against freshman Rep. Gabe Evans (R-Colo.).

The progressive candidates may not sweep those races, but the political damage lands either way. Republicans will link centrist Democrats to the party's most radical voices regardless of who holds which seat. Policy ideas like defunding the police or abolishing prisons entirely energize the activist base and repel competitive-district voters in equal measure. GOP candidates will make sure general election voters in Colorado know exactly what the rest of the Democratic coalition is demanding.