CREATE TABLE table_225093_4 (successor VARCHAR, reason_for_change VARCHAR)

Who is the successor when the reason for change is seat declared vacant January 2, 1808
SELECT successor FROM table_225093_4 WHERE reason_for_change = "Seat declared vacant January 2, 1808"
SELECT "successor" FROM "table_225093_4" WHERE "Seat declared vacant January 2, 1808" = "reason_for_change"