Overview of South Carolina Gubernatorial Runoff

Hours before South Carolina’s Republican gubernatorial runoff, an InsiderAdvantage poll sharpens the focus on Attorney General Alan Wilson’s lead. Conducted June 19-20 with 800 likely Republican voters, the survey shows Wilson ahead with 61% support, while Lieutenant Governor Pamela Evette trails at 29%. Notably, 10% of voters remain undecided.

This late surge in Wilson’s favor could determine the nomination in a low-turnout runoff where small shifts wield considerable influence. Both Wilson and Evette have President Donald Trump’s endorsement, diminishing its usual sway. The contest focuses on organization and voter turnout rather than ideological differences.

An InsiderAdvantage poll reports:

• Alan Wilson: 61% support
• Pamela Evette: 29% support
• Undecided: 10%

Polling Dynamics and Primary Background

Tuesday’s runoff follows June 9’s primary, which saw no candidate secure a majority, necessitating a showdown between top two finishers. Runoff results hinge on consolidating support from eliminated candidates. Evette garnered 28.9% in the primary, while Wilson secured 26.1%. Representatives Nancy Mace and Ralph Norman, eliminated after scoring 12.1% and 17.1% respectively, now back Wilson. Evette’s endorsements include outgoing Governor Henry McMaster.

The Evette campaign emphasized the voters’ choice between a seasoned business leader and a career politician. Their strategy remains focused on voter outreach across all counties, underlining turnout’s importance in this crucial runoff.

Key Statistics from InsiderAdvantage Poll

The InsiderAdvantage poll deploys a mixed-mode text and panel methodology, weighted by age, race, and gender. It presents a margin of error at 3.46%. The results reveal a 30-point lead, suggesting a late consolidation effect where supporters of eliminated candidates predominantly gather around Wilson. Even if undecided voters lean toward Evette, overcoming this deficit is challenging without exceptional turnout from her base.

Pre-Primary Polling Trends

Before the initial primary, polling averages indicated a divided field:

• RealClearPolitics: Evette 20.2%, Wilson 18.2%
• Race to the White House: Evette 19.3%, Wilson 17.6%
• Decision Desk HQ: Evette 19.6%, Wilson 18.5%
• 270toWin: Wilson 18.8%, Evette 18.7%
• FiftyPlusOne: Evette 20.1%, Wilson 17.4%

The averages showed Evette narrowly ahead by 1.5 percentage points. These figures highlight the fragmented race before the primary, reflecting multicandidate dynamics—a vote dispersion leading to swift support consolidation for broadly acceptable candidates.

Prediction Markets Overview

Prediction markets suggest a strong likelihood of Wilson’s victory:

• Kalshi: Wilson 98.4%, Evette 1.5%
• Polymarket: Wilson 98%, Evette negligible

These platforms integrate polling, news flow, and trader expectations. While markets can outperform traditional polls by synthesizing diverse information, they have limitations—liquidity affects price sensitivity, and participants may not mirror voters. Nonetheless, when markets decisively swing, they tend to reflect widespread outcome expectations.

General Election Forecast

Looking past the runoff, forecasters uniformly categorize South Carolina as a safe Republican stronghold:

• Inside Elections: Solid Republican
• Race to the White House: Likely Republican
• RealClearPolitics: Likely Republican
• Sabato’s Crystal Ball: Safe Republican
• Cook Political Report: Solid Republican

This consensus emphasizes Tuesday’s primary stakes, positioning the GOP winner as the general election favorite. Democratic State Representative Jermaine Johnson, who secured his primary win with 59.7%, aims to become the state’s first Democratic governor since 1998.

Outlook and Final Considerations

The data indicates a structurally settled race. Despite this, runoffs are characterized by low-turnout dynamics, allowing for unlikely outcomes triggered by mobilization rather than persuasion. Polling stations across South Carolina open from 7 a.m. to 7 p.m. Any remaining uncertainty hinges not on voter preference but on turnout.