CREATE TABLE table_1797 ("State  ( class ) " TEXT, "Vacator" TEXT, "Reason for change" TEXT, "Successor" TEXT, "Date of successors formal installation" TEXT)

How many vacant seats were filled by newcomer Joseph H. Bottum (r)?
SELECT COUNT("Vacator") FROM table_1797 WHERE "Successor" = 'Joseph H. Bottum (R)'
SELECT COUNT("Vacator") FROM "table_1797" WHERE "Successor" = 'Joseph H. Bottum (R)'