CREATE TABLE table_26640 ("District" CLOB, "Vacator" CLOB, "Reason for change" CLOB, "Successor" CLOB, "Date successor seated" CLOB)

Name the successor for election was successfully contested july 30, 1861
SELECT "Successor" FROM table_26640 WHERE "Reason for change" = 'Election was successfully contested July 30, 1861'
SELECT "Successor" FROM "table_26640" WHERE "Reason for change" = 'Election was successfully contested July 30, 1861'