Table: election_results_1940
Columns: district
incumbent
party
first_elected
result
candidates

Question: William Fadjo Cravens is the only candidate who was first elected in 1939.
SQL: SELECT COUNT("first_elected") FROM election_results_1940 WHERE "incumbent" = 'William Fadjo Cravens'

Question: William Fadjo Cravens serves the fourth district of Arkansas.
SQL: SELECT "district" FROM election_results_1940 WHERE "incumbent" = 'William Fadjo Cravens'