CREATE TABLE table_23084 ("District" TEXT, "Vacator" TEXT, "Reason for change" TEXT, "Successor" TEXT, "Date successor seated" TEXT)

Name the vacator for wisconsin 1st
SELECT "Vacator" FROM table_23084 WHERE "District" = 'Wisconsin 1st'
SELECT "Vacator" FROM "table_23084" WHERE "District" = 'Wisconsin 1st'