President Donald Trump’s endorsement is still a big deal in South Carolina, and while prediction markets back his candidate, the SC governor Republican primary is looking more like Iowa than the White House would like. 

Prediction markets have Lt. Gov. Pamela Evette well out front after Trump backed her, yet the polls and the media are still making this look like a much closer race than the trading board suggests heading into Tuesday’s primary.

It is reminiscent of last week’s Republican governor primary, where traders had pegged Trump-endorsed Randy Feenstra with a greater than 80% chance of winning, only to see him lose to Zach Lahn. It was a rare miss this 2026 midterm election season for both Trump-endorsed candidates and prediction markets.

Trump did what he usually does in a crowded GOP primary and attempted to clear the field with an endorsement. 

In South Carolina, that meant lining up behind Evette and effectively signaling to Republican voters that she is the preferred heir in the race to replace Gov. Henry McMaster. Markets immediately responded, and Evette became the clear favorite on both Kalshi and Polymarket.

She’s at 81% on Kalshi heading into Tuesday, with $1.3 million in volume.

Prediction markets are built to capture that kind of reaction. But the South Carolina race also shows the limits of a Trump endorsement with a crowded field. Voters are still weighing local issues, candidate quality, and name recognition. That’s something traders might not see.

The market moved fast, but the polling and press coverage suggest the race may not be nearly as settled as the odds imply.

The comparison to Iowa is important because it shows what can happen when the market gets too confident in Trump’s ability to settle a primary. 

In Iowa, the Trump-backed favorite looked like a runaway in the market and then failed to deliver. South Carolina may not end the same way, but the shape is familiar. Trump picks a horse, the market piles in, and the vote count could still tell a more complicated story.

New polling this month has Evette up between three and five points, with five GOP candidates receiving more than 12% support.

That matters even more because Trump’s grip on the GOP primary electorate is not the same thing as total control. Recent New York Times reporting suggests Republican voters in South Carolina are still thinking about who can actually run the state, not just who can win a Trump stamp of approval. That creates room for a closer race than the markets are pricing.

U.S. Rep. Nancy Mace is part of what makes this race harder to read. She was once a Trump favorite and MAGA darling, but that relationship has cooled, and Trump’s move to endorse Evette instead turns the primary into a test of how much of the Trump lane still belongs to Mace. 

The answer, at least so far, looks like “not enough to make her the market favorite,” but also not so little that she disappears from the conversation. She’s at 3% on Kalshi. Of note, the winner of the New Jersey GOP Senate nomination last week was a distant third heading into election day. 

That’s why the South Carolina primary is more than just an endorsement story. It’s a test of whether GOP voters are following Trump as cleanly as the market thinks they are, or whether the race is still being shaped by local dynamics and candidate-specific baggage. 

Mace’s decline from Trump darling to sidelined contender says a lot about how volatile the field still is.

Tuesday should show whether the market is right to trust the Trump effect or whether this race is more Iowa than it looks. If Evette runs away with it, the market will have correctly read both the endorsement and the electorate. 

If the result comes in closer than the odds suggest, then South Carolina becomes another reminder that a Trump endorsement can move a race without fully controlling it. Trump endorsements still matter, but the size of the effect is what traders keep trying to price. 

South Carolina will tell us whether the market has that right, or whether it is once again assuming too much from a presidential nod in a crowded primary. 

If Trump’s endorsement still clears the field, then prediction markets have another clean win. If it doesn’t, then the prediction markets may need to keep adjusting for a GOP primary electorate that is still willing to nod along with Trump without always doing exactly what he wants.

The post Trump Endorsement Faces Iowa-Style Test in South Carolina GOP Governor Primary appeared first on DeFi Rate.

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