CREATE TABLE table_26641 ("District" TEXT, "Vacator" TEXT, "Reason for change" TEXT, "Successor" TEXT, "Date successor seated" TEXT)

Name the successor for vacant and december 3, 1862
SELECT "Successor" FROM table_26641 WHERE "Reason for change" = 'Vacant' AND "Date successor seated" = 'December 3, 1862'
SELECT "Successor" FROM "table_26641" WHERE "Date successor seated" = 'December 3, 1862' AND "Reason for change" = 'Vacant'