Incumbent Republican Sheri Biggs holds a commanding lead in the SC-03 House race, reflected in trader consensus above 95 percent, driven by the district’s strong Republican partisan voter index of R+21 and her unopposed primary. Biggs benefits from incumbency since her 2024 election, substantial fundraising exceeding $500,000 compared with Democratic nominee Eunice Lehmacher’s roughly $93,000, and endorsements from groups including the U.S. Chamber of Commerce. Lehmacher advanced from a narrow June 2026 primary win but faces structural barriers in this solidly Republican district rated Safe or Solid R by Cook, Inside Elections, and Sabato’s Crystal Ball. A late scandal, health issue, or unexpected national shift could alter outcomes, though such developments remain low-probability factors ahead of the November 3 general election.