CREATE TABLE table_18551 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Who are the candidates in the election in the Ohio 9 district?
SELECT "Candidates" FROM table_18551 WHERE "District" = 'Ohio 9'
SELECT "Candidates" FROM "table_18551" WHERE "District" = 'Ohio 9'