Internal campaign polling in March 2026 placed Nancy Mace as the early front-runner in the South Carolina Republican gubernatorial primary, with approximately 24 percent support. Her standing in the field declined through April and May.

By late May 2026, following Trump's May 29 endorsement of rival Pamela Evette, polling placed Mace at approximately 12 to 15 percent. Any additional figures added to this entry must cite the pollster, sample size, field dates, and margin of error.