CREATE TABLE "united_states_house_of_representatives_e" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" real,
  "result" text,
  "candidates" text
);

Question: How many candidates won the election of john n. sandlin?
SQL: SELECT COUNT("candidates") FROM "united_states_house_of_representatives_e" WHERE "incumbent"='John N. Sandlin';

Question: Who was the incumbent in the election of henry garland dupré (d) unopposed?
SQL: SELECT "incumbent" FROM "united_states_house_of_representatives_e" WHERE "candidates"='Henry Garland Dupré (D) Unopposed';