Who is the incumbent that is listed with the candidates listed as marilyn lloyd (d) 57.4% harold w. coker (r) 42.6%?
CREATE TABLE "united_states_house_of_representatives_e" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" real,
  "result" text,
  "candidates" text
);
SELECT "incumbent" FROM "united_states_house_of_representatives_e" WHERE "candidates"='Marilyn Lloyd (D) 57.4% Harold W. Coker (R) 42.6%';