Table: election_results_9
Columns: district
incumbent
party
first_elected
result
candidates

Question: Who were the candidates when Noah M. Mason was incumbent?
SQL: SELECT "candidates" FROM election_results_9 WHERE "incumbent" = 'Noah M. Mason'

Question: In what year was Leo E. Allen first elected?
SQL: SELECT "first_elected" FROM election_results_9 WHERE "incumbent" = 'Leo E. Allen'

Question: Who were the candidates when Sid Simpson was the incumbent?
SQL: SELECT "candidates" FROM election_results_9 WHERE "incumbent" = 'Sid Simpson'