CREATE TABLE "table1_1694505_4" (
  "district" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_successor_seated" text
);

Question: In the district Wisconsin 2nd, what was the reason for change?
SQL: SELECT "reason_for_change" FROM "table1_1694505_4" WHERE "district"='Wisconsin 2nd';