SC-01

South Carolina's 1st congressional district covers the state's Atlantic coast, anchored by Charleston and the Lowcountry region extending north through the Grand Strand towards the North Carolina border and inland into suburban and exurban communities around the city. Charleston is one of the fastest-growing cities in the American South, drawing professional and military-adjacent residents that have gradually altered the district's demographic composition. The seat has been a reliable Republican hold but its coastal urban growth introduces long-run competitive tension.

Cook Political Report moved SC-01 from SAFE Republican to Likely Republican on 18 June 2026 as part of a seven-seat uniform shift. The Cook downgrade is driven primarily by the national environment rather than a district-specific development; SC-01 has no redistricting controversy and no known competitive challenger at this stage. The move reflects the breadth of the Republican vulnerability signal Cook is reading into tariff-related economic pressure.

South Carolina's post-Callais redistricting fight focused on the state Senate's failure to pass a calendar-driven remap rather than on SC-01 specifically. The Lowcountry seat's shift from SAFE to Likely Republican is notable primarily as evidence that Cook's concern extends well beyond the obvious agricultural and rust-belt battlegrounds into previously solid coastal Republican turf.