Question: When Nathaniel G. Taylor (U) is the successor what is the vacator?
SQL: SELECT "Vacator" FROM "1-2147588-4" WHERE "Successor" = 'Nathaniel G. Taylor (U)';

Question: When William B. Campbell (U) is the successor what is the district?
SQL: SELECT "District" FROM "1-2147588-4" 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 "1-2147588-4" 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 "1-2147588-4" WHERE "Successor" = 'John W. Leftwich (UU)';

Question: When New York 8th is teh district who is the successor?
SQL: SELECT "Successor" FROM "1-2147588-4" WHERE "District" = 'New York 8th';