CREATE TABLE table_20874 ("District" TEXT, "Vacator" TEXT, "Reason for change" TEXT, "Successor" TEXT, "Date successor seated" TEXT)

who is the vacator whre the district is new jersey 2nd?
SELECT "Vacator" FROM table_20874 WHERE "District" = 'New Jersey 2nd'
SELECT "Vacator" FROM "table_20874" WHERE "District" = 'New Jersey 2nd'