What is the first date of election for the incumbent that was re-elected in the South Carolina 1 district?
CREATE TABLE "south_carolina" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" text,
  "result" text
);
SELECT "first_elected" FROM "south_carolina" WHERE "result"='re-elected' AND "district"='south carolina 1';