CREATE TABLE table_18284 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What district is incumbent jack hightower from?
SELECT "District" FROM table_18284 WHERE "Incumbent" = 'Jack Hightower'
SELECT "District" FROM "table_18284" WHERE "Incumbent" = 'Jack Hightower'