CREATE TABLE "table1_2417330_4" (
  "district" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_successor_seated" text
);

Question: Name the date successor seated for successor being vacant
SQL: SELECT "date_successor_seated" FROM "table1_2417330_4" WHERE "successor"='Vacant';

Question: Name the vacator for kentucky 2nd
SQL: SELECT "vacator" FROM "table1_2417330_4" WHERE "district"='Kentucky 2nd';

Question: Name the successor for election was successfully contested july 30, 1861
SQL: SELECT "successor" FROM "table1_2417330_4" WHERE "reason_for_change"='Election was successfully contested July 30, 1861';

Question: Name the successor for vacant and december 3, 1862
SQL: SELECT "successor" FROM "table1_2417330_4" WHERE "reason_for_change"='Vacant' AND "date_successor_seated"='December 3, 1862';