Mace Falls to 25% in SC Governor Race After Capitol Hill Feud

Nancy Mace's Capitol Hill War With Cory Mills Just Blew Up Her Own Campaign

Six weeks before the June 9 South Carolina Republican gubernatorial primary, Nancy Mace picked a fight in Washington that boomeranged straight into her campaign. On April 21, the congresswoman introduced a resolution to expel Rep. Cory Mills from the House over allegations of sexual misconduct and campaign finance violations. Within 24 hours, Mills fired back by resurfacing old claims about Mace's alcohol consumption, posting video of her apparently playing a drinking game alongside her own denials of heavy alcohol use. The exchange pulled the House Ethics Committee's separate investigation into Mace's alleged improper reimbursement claims back onto the front page.

The timing could not be worse. Mace entered the week as the established frontrunner in a fractured five-way Republican field, leading with 24% in a Stratus Intelligence survey and 22% in a Quantus Insights poll. Those numbers sound modest, but in a race where no other candidate has cracked 22%, they represent a meaningful structural advantage. The problem: a lead that thin is built on soft ground, and the DC mud fight is exactly the kind of distraction that erodes it.

Prediction Markets Put a Number on the Mace Fallout: A 10-Point Drop in Three Days

Bettors moved fast. Mace's implied probability of winning the Republican nomination fell from 34% to 25% across Kalshi and Polymarket over three days, a 10-percentage-point decline that represents roughly a 26% reduction in her assessed chances. As of April 26, Kalshi prices her at 24% while Polymarket sits at 26%, a tight spread that confirms both platforms are reading the same information.

This was not a slow leak. A three-day reprice of this magnitude in a political market signals a discrete event, and the timeline aligns precisely with the Mills feud going public on April 21-22. The market hit a period low of 24% before recovering a single point. What makes the drop especially telling is that no single rival appears to have captured all of Mace's lost probability. That pattern suggests bettors are pricing in generalized uncertainty about Mace rather than a specific challenger surging. In a five-way race where the frontrunner leads by single digits, diffuse doubt is more dangerous than a direct attack from one opponent.

The Skeletons Cory Mills Didn't Create, But Did Exhume

Mills didn't invent Mace's vulnerabilities. He merely reminded voters they exist. The Ethics Committee investigation into Mace's housing reimbursements has been publicly known since early March, when the panel opened a formal probe into whether she over-billed her congressional office for housing expenses between 2023 and 2024. Mace has denied wrongdoing. In isolation, that story had faded from the news cycle. Mills's counterattack welded it back onto her public profile at the worst possible moment.

The alcohol allegations carry a particular sting in a South Carolina Republican primary. Mace has previously stated she cannot consume alcohol, which made Mills's video clip of her in an apparent drinking game a direct credibility challenge. Whether the clip is misleading is beside the point: it forces Mace to spend campaign bandwidth on personal defense rather than policy contrast with Attorney General Alan Wilson, Lt. Gov. Pamela Evette, or Rep. Ralph Norman. In a primary where the RealClearPolitics average showed only 2.3 points separating Mace (18.8%) from Evette (18.0%) as of late March, even minor attention shifts among undecided voters could be decisive.

Here is the proof point that makes the market's reaction rational: Mace held a narrow polling lead (24% in Stratus, 22% in Quantus) in a fractured five-way field. That means even a small erosion of her support from the DC drama could hand the nomination to Wilson or Evette without Mace losing a single South Carolina voter to a direct attack. The threat is not that Republican voters abandon Mace for someone else; it is that soft supporters simply drift, and in a field this crowded, drifting is enough.

The Case for Mace: Why 25% Might Be an Overreaction

Before writing off her candidacy, consider what Mace still has working in her favor. She remains the only candidate in the field with a national media profile and a proven ability to raise money from outside South Carolina. Her brand as "Trump in high heels," as she described herself when filing for the race on March 23, gives her a lane in a primary where MAGA credentialing matters. Neither Wilson nor Evette carries the same name recognition advantage with base Republican voters who follow national politics.

There is also a plausible case that the Mills feud actually reinforces Mace's strongest narrative. She positioned her expulsion resolution around her identity as a survivor of rape and domestic abuse, writing that "we are done letting it slide" when it comes to sexual predators in Congress. If South Carolina primary voters see the fight through that lens rather than through the retaliatory alcohol allegations, Mace could emerge from the controversy with her core supporters more committed, not less. Capitol Hill feuds often feel distant to state-level electorates; the question is whether local media amplifies Mills's counterattacks or Mace's original framing.

The Ethics Committee investigation is the more durable threat, because it has a resolution timeline that could extend well past the June 9 primary. If the panel issues findings or takes formal action before voters go to the polls, the damage could compound. If it remains procedurally dormant, the investigation functions as background noise rather than a decisive blow.

What Moves the Price From Here

At 25%, the market is saying Mace is still the most likely individual winner in a field where nobody commands even a third of the vote, but that her advantage has narrowed to a coin-flip margin over the next-best contender. For the price to recover toward 34%, Mace needs two things: the Mills feud must fade from South Carolina media coverage, and no new developments in the Ethics Committee probe can surface before June 9. Both are plausible. Neither is guaranteed.

For the price to fall further, look for two catalysts. First, any polling conducted after April 22 that shows Mace losing her lead to Wilson or Evette would confirm the market's worst-case read. Second, if the Ethics Committee accelerates its timeline or releases interim findings, Mace's credibility gap widens at a moment when she has no room to absorb it. The June 9 primary is 44 days away. In a five-way race with single-digit margins, that is both an eternity and no time at all.