 how many dbeingtrict with candidates being william b. bankhead (d) 71.3% e. m. reed (r) 28.7%
CREATE TABLE "united_states_house_of_representatives_e" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" real,
  "result" text,
  "candidates" text
);
SELECT COUNT("district") FROM "united_states_house_of_representatives_e" WHERE "candidates"='William B. Bankhead (D) 71.3% E. M. Reed (R) 28.7%';