CREATE TABLE table_3010 ("District" TEXT, "Vacator" TEXT, "Reason for change" TEXT, "Successor" TEXT, "Date successor seated" TEXT)

When was successor David Atwood (R) seated?
SELECT "Date successor seated" FROM table_3010 WHERE "Successor" = 'David Atwood (R)'
SELECT "Date successor seated" FROM "table_3010" WHERE "Successor" = 'David Atwood (R)'