Socialist-Backed Candidates Sweep Democratic Primaries, Deepening Party Divide
In a stunning display of political force, New York City Mayor Zohran Mamdani’s endorsed slate of congressional candidates swept Democratic primary elections on June 23, defeating two incumbent representatives and an establishment-backed successor in New York. The results have sent shockwaves through the Democratic Party, prompting sharp warnings from moderates and reigniting the long-simmering battle between the party’s progressive and establishment wings.
The Mamdani Sweep
All three candidates backed by Mamdani — a democratic socialist who took office as New York’s 112th mayor in January 2026 — won their primaries decisively. Brad Lander, a former NYC comptroller, defeated two-term incumbent Rep. Dan Goldman in the 10th district by a commanding 65.7% to 34.1% margin. Darializa Avila Chevalier, a doctoral student and pro-Palestinian activist, toppled five-term incumbent Rep. Adriano Espaillat in the 13th district. And Claire Valdez defeated Antonio Reynoso, the handpicked successor of retiring Rep. Nydia Velazquez, in the 7th district.
According to AP News, the winning candidates campaigned on a platform of abolishing ICE, taxing the rich, and strongly criticizing Israel’s actions in Gaza — positions that have become defining litmus tests within the party.
Fetterman’s Blistering Warning
The most forceful response came from Sen. John Fetterman (D-PA), who called the winners “dirtbag left” candidates and warned that the Democratic Party is “drifting firmly into communism.” Speaking on Fox News’s The Will Cain Show, Fetterman argued there is a “perfect correlation” between anti-Israel and anti-American sentiment among the party’s left flank, as Fox News reported.
“If you want to get elected as a Democrat now [you have to] hate on Israel and say the strongest anti-Israel kinds of statements,” Fetterman said, adding that such views are “anti-Western civilization.”
A Party Divided
The primary results have exposed starkly different reactions from Democratic leaders. House Minority Leader Hakeem Jeffries downplayed the significance, telling the BBC that “a handful of primaries that go in one direction or the other, in a given state or two, aren’t going to reshape who we are as House Democrats.”
Sen. Bernie Sanders (I-VT), who campaigned for Mamdani’s slate, celebrated the results, arguing that voters are “sick and tired of status quo establishment politics.” Sen. Chris Murphy (D-CT) struck a similar note, saying the party needs to be “bolder in the policies we’re proposing and bolder in the tactics we use.”
President Donald Trump seized on the results, calling the winners “communists” on social media and framing the outcome as evidence that Democrats are “going radical left.”
Beyond New York: A National Trend
The progressive wave extended well beyond New York. Democratic socialist Nithya Raman advanced to a November runoff against Los Angeles Mayor Karen Bass. In Washington, D.C., democratic socialist Janeese Lewis George leads the mayoral primary to replace outgoing Mayor Muriel Bowser. Progressive Abdul El-Sayed leads polls for Michigan’s open Senate seat, and Graham Platner won the Democratic Senate primary in Maine.
The Mamdani Factor
Mamdani’s rapid rise from state assemblyman to mayor to national kingmaker has been remarkable. Elected in a stunning upset over former Governor Andrew Cuomo in November 2025, the 34-year-old son of renowned academic Mahmood Mamdani and filmmaker Mira Nair has leveraged the Democratic Socialists of America’s grassroots infrastructure to build a formidable political machine. Just six months into his mayoral term, he successfully translated his electoral coattails into concrete primary victories.
What It Means for November
The primary results pose a strategic dilemma for Democrats as they head toward the November 2026 midterm elections. While progressive victories energize the party’s activist base, they risk alienating moderate swing voters in competitive districts — a dynamic Republicans are eager to exploit. With Democrats needing to flip just a few seats to retake the House, the perception of the party as “socialist” could be a significant liability in moderate districts.
Brad Lander, the victor in NY-10, framed the results as a mandate for change. “Voters are just pissed off,” he told AP News. “They want people who show who they’re fighting for, and really get out and fight for things that matter in the lives of working people.”
Mamdani himself struck a conciliatory but firm tone: “It’s not just a question of electing more Democrats. It’s a question of electing better Democrats.”
What to Watch For
As the general election campaign begins, several questions loom: Can the progressive primary winners hold their seats in November, particularly in competitive districts? Will the Democratic establishment actively support them or withhold resources? And how effectively will Republicans weaponize these results in swing districts across the country?
One thing is clear: the battle for the soul of the Democratic Party is far from over, and the June 23 primaries may prove to be just the opening act in a much larger struggle that will shape American politics for years to come.