CREATE TABLE "table1_2147588_4" (
  "district" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_successor_seated" text
);

Question: When nathaniel g. taylor (u) is the successor what is the vacator?
SQL: SELECT "vacator" FROM "table1_2147588_4" WHERE "successor"='Nathaniel G. Taylor (U)';

Question: When william b. campbell (u) is the successor what is the district?
SQL: SELECT "district" FROM "table1_2147588_4" WHERE "successor"='William B. Campbell (U)';

Question: When james brooks (d) is the vacator what is the date the successor was seated?
SQL: SELECT "date_successor_seated" FROM "table1_2147588_4" WHERE "vacator"='James Brooks (D)';

Question: When john w. leftwich (uu) is the successor what is the date the successor was seated?
SQL: SELECT "date_successor_seated" FROM "table1_2147588_4" WHERE "successor"='John W. Leftwich (UU)';

Question: When new york 8th is teh district who is the successor?
SQL: SELECT "successor" FROM "table1_2147588_4" WHERE "district"='New York 8th';