CREATE TABLE table_18587 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

Who were the candidates when Noah M. Mason was incumbent?
SELECT "Candidates" FROM table_18587 WHERE "Incumbent" = 'Noah M. Mason'
SELECT "Candidates" FROM "table_18587" WHERE "Incumbent" = 'Noah M. Mason'