CREATE TABLE table_2631 ("State  ( class ) " CLOB, "Vacator" CLOB, "Reason for change" CLOB, "Successor" CLOB, "Date of successors formal installation" CLOB)

Name the state class for isaac d. barnard (j)
SELECT "State (class)" FROM table_2631 WHERE "Vacator" = 'Isaac D. Barnard (J)'
SELECT "State (class)" FROM "table_2631" WHERE "Vacator" = 'Isaac D. Barnard (J)'