CREATE TABLE table_28867 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT, "Candidates" TEXT)

Who was the 'incumbent' of district south carolina 7?
SELECT "Incumbent" FROM table_28867 WHERE "District" = 'South Carolina 7'
SELECT "Incumbent" FROM "table_28867" WHERE "District" = 'South Carolina 7'