CREATE TABLE table_2417330_4 (successor VARCHAR, reason_for_change VARCHAR)

Name the successor for election was successfully contested july 30, 1861
SELECT successor FROM table_2417330_4 WHERE reason_for_change = "Election was successfully contested July 30, 1861"
SELECT "successor" FROM "table_2417330_4" WHERE "Election was successfully contested July 30, 1861" = "reason_for_change"