Table schema:
CREATE TABLE table_1342292_2 (district VARCHAR, candidates VARCHAR)

Question:  how many dbeingtrict with candidates being william b. bankhead (d) 71.3% e. m. reed (r) 28.7%
SQL: SELECT COUNT(district) FROM table_1342292_2 WHERE candidates = "William B. Bankhead (D) 71.3% E. M. Reed (R) 28.7%"