Who were the candidates for election that had a result of a retired jacksonian gain?
CREATE TABLE "united_states_house_of_representatives_e" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" text,
  "result" text,
  "candidates" text
);
SELECT "candidates" FROM "united_states_house_of_representatives_e" WHERE "result"='Retired Jacksonian gain';