CREATE TABLE table_73409 ("State  ( class ) " TEXT, "Vacator" TEXT, "Reason for change" TEXT, "Successor" TEXT, "Date of successors formal installation" TEXT)

Name the successor for elected january 26, 1837
SELECT COUNT("Successor") FROM table_73409 WHERE "Date of successors formal installation" = 'Elected January 26, 1837'
SELECT COUNT("Successor") FROM "table_73409" WHERE "Date of successors formal installation" = 'Elected January 26, 1837'