CREATE TABLE table_name_54 (state__class_ VARCHAR, successor VARCHAR)

Which State (class) has a Successor of harry f. byrd, jr. (d)? Question
SELECT state__class_ FROM table_name_54 WHERE successor = "harry f. byrd, jr. (d)"
SELECT "state__class_" FROM "table_name_54" WHERE "harry f. byrd, jr. (d)" = "successor"