Socialists Keep Winning Primaries. Kalshi's Odds Won't Budge

On Tuesday morning, the betting market Kalshi gave Florida state Rep. Angie Nixon an 8% chance of winning her Senate primary. A "yes" on Nixon cost about 8 cents, and it would pay a full dollar if she somehow pulled it off. Her opponent, Alexander Vindman — yes, the impeachment-hearings Vindman — had raised more than sixteen times her money and sat at 91 cents, which is the market's way of saying this is over.

By Tuesday night, Nixon, a self-described democratic socialist who raised less than $1 million, had beaten Vindman 56-44. Anyone who put $100 on her that morning woke up Wednesday with about $1,150. And a socialist is now a major-party nominee for the United States Senate. In Florida.

If your reaction to that sentence is somewhere between "wait, really?" and "how is this happening?" — good. That's the correct reaction, and it's the whole story of this election summer. Nixon is one more name on a streak that has been steamrolling the Democratic establishment since June, while the people with actual money on the midterms have watched the whole thing and... shrugged. As I write this, Kalshi's bettors give Democrats about an 84% chance of winning the House and Republicans a narrow edge to hold the Senate: numbers that have barely flinched through the entire socialist surge.

One of two things is true. Either the market knows something the shouting doesn't. Or it's about to get caught sleeping again, the way it did on Tuesday. Let's take both seriously; there's real money on the answer either way.

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The Summer the Establishment Kept Losing

Start with the scoreboard, because it's flat-out wild.

In New York on June 23, Claire Valdez won her House primary in NY-7 by roughly 21 points. Valdez isn't just endorsed by the Democratic Socialists of America: she's what DSA calls a "cadre" candidate, meaning an actual organizer the organization ran on purpose, and she's expected to become the first of that kind ever seated in Congress. Her post-victory message, per the Queens Daily Eagle: "not going to compromise." Same night, same city: 32-year-old DSA member Darializa Avila Chevalier knocked off five-term Rep. Adriano Espaillat, the sitting chair of the Congressional Hispanic Caucus, by a 49-46 margin.

A week later in Denver, 29-year-old democratic socialist Melat Kiros ended 15-term Rep. Diana DeGette's career by around ten points, on the strength of a volunteer operation that reported half a million phone calls. In August, DSA-backed Donavan McKinney unseated Rep. Shri Thanedar in Michigan. And in the marquee race, Abdul El-Sayed, the Bernie Sanders wing's candidate, won Michigan's open Senate primary by a single point despite roughly $65 million in outside money against him and a late endorsement of his opponent by Gov. Gretchen Whitmer herself.

Add it up: a Brookings analysis counted 282 DSA-endorsed candidates running this cycle across every level of government, and more than 30 socialists had won primaries even before Nixon's Tuesday shocker. The mayor of New York City, Zohran Mamdani, is an open democratic socialist whose endorsement swept the June primaries. Whatever you want to call what's happening inside the Democratic Party, it now comes with a win-loss record.

And the party's leadership is handling it with all the composure of a man smiling through a fire alarm. Asked about the DSA agenda on Sunday's Meet the Press, House Democratic leader Hakeem Jeffries went with: "I do not support defunding the police. I do not support open borders. I do not support abolishing the Senate," while carefully leaving the door open for the socialists to join his caucus in January. Chuck Schumer's answer: "We are a big tent party." The DNC chair spent last weekend telling members to knock off the litmus tests. Meanwhile a centrist Democratic group called Third Way is spending $15 million to fight the left directly, warning that candidates who "follow the siren song of the left... will steer their ships into the rocks." That's a party having an argument about what it is, in public, three months before an election.

The Case That This Blows Up in Democrats' Faces

Now the bear case, and it isn't subtle, because Republicans are not being subtle about it.

Donald Trump called the socialist wins proof that "the communists" are "making their move," and described democratic socialism as "the biggest threat to our nation there is, maybe since our founding... That includes World War I, World War II, September 11th." A memo circulated to House Republican offices in July (reported by the Washington Examiner) laid the strategy out with unusual honesty: their polling found voters fear the word "communism" (42%) far more than "socialism" (15%), so members were instructed to "connect all three together, because these government systems are fruit of the same poisonous tree."

The ad money is already moving. The House Republicans' campaign arm ran ads across 49 battleground districts starring Mamdani as "the new socialist mayor" who "built his movement on defunding the police." Mamdani alone has drawn $5.5 million in negative advertising, per the ad tracker AdImpact, which makes a man who isn't on a single 2026 ballot one of the most-attacked figures of the cycle. In New Hampshire, Scott Brown's Senate campaign spliced Rep. Chris Pappas into footage with Mamdani and AOC and called him "Comrade Chris." And here's the part worth slowing down for: in Arizona's most important swing House district, the GOP is running ads branding Democratic nominee Amish Shah a "socialist" — and Shah, as far as any reporting can establish, isn't one. No DSA endorsement, no self-description, nothing. The label has become detachable. It gets applied to whoever is standing closest.

Democrats have seen this movie. The backlash after the 2020 election produced one of the most infamous leaked calls in recent party history, when Rep. Abigail Spanberger told her colleagues, profanity included: "We need to not ever use the word 'socialist' or 'socialism' ever again... We lost good members because of that." The research firm Equis later found that four in ten Latino voters in 2020 worried Democrats were "embracing socialism," a finding many blame for the party's Florida collapse. And a CBS News poll taken just last week found the country as a whole still views socialism negatively, while 58% of Democrats now view it positively. Read those two numbers together and you can see the trap: the label energizes the primary electorate that keeps nominating socialists, and repels some slice of the general electorate that decides close races. The country, you might reasonably conclude, is not ready for this.

So why on earth are Democrats still 84 cents to take the House?

Why the Market Refuses to Panic

Because the people betting have noticed where the socialists are winning, and mostly it's places Democrats cannot lose.

Go back through the list. Valdez's NY-7, Avila Chevalier's NY-13, Kiros's CO-1, McKinney's MI-13: all deep, deep blue seats where the Democratic primary is the election. That Brookings study of 282 DSA-endorsed candidates found only ten winners in districts even slightly competitive. Control of the House will be decided in a few dozen purple districts, and there are almost no actual socialists on the ballot in any of them. A socialist replacing a standard-issue Democrat in Brooklyn changes what the party sounds like without moving the seat count an inch. And seats are what the market is pricing: counted that way, the socialist surge and an 84-cent Democratic House describe the same map.

The market also got a data point the panic narrative didn't want: the surge has a ceiling. On the same Tuesday Nixon shocked Florida, a DSA union organizer named Oliver Larkin ran the left's playbook against Rep. Jared Moskowitz in another Florida district and lost 63-37. Where the establishment actually shows up and the incumbent isn't sleepwalking, the insurgency has been beatable.

But here is where it gets interesting for anyone who likes betting on things: the market's calm has two stress tests running right now, with live prices attached.

Michigan. El-Sayed vs. Republican Mike Rogers for an open Senate seat in a true coin-flip state. Kalshi currently makes El-Sayed a modest favorite, around the mid-50s in cents, down about six cents after the first post-primary Fox News poll put Rogers ahead 51-47. The Republican Senate campaign arm is already running ads tying El-Sayed to Mamdani. This is the purest referendum available on the question you actually care about: does the socialist label sink a candidate in a state Democrats must win? If that number slides through the fall, it's the earliest warning you'll get — earlier than any pundit — that the drag is real. Our full breakdown of that race is here.

Florida. Nixon vs. appointed Republican incumbent Ashley Moody. The market gives Nixon about 8 cents — a 12-to-1 underdog. Which, you'll notice, is the exact price the market had on her Tuesday morning. The honest caveat: that primary market was thin, with only about $50,000 changing hands in the final day, and small markets miss. The general election will attract far more money and be far harder to shock. But if you believe the market has now underestimated the same woman twice, it has never been cheaper to say so with actual stakes. (Our primary-day coverage of that race, 8-cent price and all, is here.)

What Actually Moves the Number

If you want to follow this like a trader instead of arguing about it like everyone else in your group chat, watch four things. Watch El-Sayed's price, for the reason above. Watch whether the "socialist" label sticks to non-socialists: if Pappas in New Hampshire or Shah in Arizona start sliding in the polls under Mamdani-splice ads, the contagion theory is working, and that 84-cent House number is too high. Watch the Democratic leadership: the day the "big tent" answers stop and someone with a title starts publicly fighting the nominees, the party's November math changes. And watch Nixon's margin even if she loses: a socialist running ten points ahead of expectations in Florida would tell you more about 2028 than most of what happens in between.

Here's the thing I keep coming back to. Every argument about whether America is "ready" for socialist candidates used to be unfalsifiable: cable panels yelling into the void, forever. Now there's a number. Several numbers, actually, updating every day, backed by people risking real money, occasionally getting embarrassed (ask anyone who sold Nixon at 8 cents), and correcting in public. The country votes on the question in November. The market votes on it every single day between now and then, and unlike the group chat, it keeps score.

Prices quoted are live Kalshi market prices as of Wednesday morning, August 20, 2026, and will keep moving until these markets settle. Kalshi is a CFTC-regulated event-contract exchange (18+; availability varies by state). OddsShopper covers prediction markets as an independent analyst: any model or panel figures referenced are model estimates, not predictions of fact and not financial advice. This article does not advocate for or against any candidate or party. Trading involves risk; contracts can go to zero.

Hero photo: Bernie Sanders rally, Reno, Nevada, December 2019, by Trevor Bexon, licensed CC BY 2.0; cropped and toned.