Which Socialist candidate ran against American Labor candidate Caroline O'Day?
CREATE TABLE "1938_state_election_results" (
  "office" text,
  "democratic_ticket" text,
  "republican_ticket" text,
  "american_labor_ticket" text,
  "socialist_ticket" text
);
SELECT "socialist_ticket" FROM "1938_state_election_results" WHERE "american_labor_ticket"='caroline o''day';