CREATE TABLE table_20876 ("District" CLOB, "Vacator" CLOB, "Reason for change" CLOB, "Successor" CLOB, "Date successor seated" CLOB)

who was the successor for district ohio 15th?
SELECT "Successor" FROM table_20876 WHERE "District" = 'Ohio 15th'
SELECT "Successor" FROM "table_20876" WHERE "District" = 'Ohio 15th'