Name the successor for election was successfully contested july 30, 1861
CREATE TABLE "table1_2417330_4" (
  "district" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_successor_seated" text
);
SELECT "successor" FROM "table1_2417330_4" WHERE "reason_for_change"='Election was successfully contested July 30, 1861';