CREATE TABLE "table1_2159506_4" (
  "district" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_successor_seated" text
);

Question: Who are all successors when reason for change is died May 12, 1964?
SQL: SELECT "successor" FROM "table1_2159506_4" WHERE "reason_for_change"='Died May 12, 1964';

Question: What is every district for reason for change is died August 9, 1964?
SQL: SELECT "district" FROM "table1_2159506_4" WHERE "reason_for_change"='Died August 9, 1964';