CREATE TABLE table_18249 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

In what district would you find the candidates listed as jim cooper (d) unopposed?
SELECT "District" FROM table_18249 WHERE "Candidates" = 'Jim Cooper (D) Unopposed'
SELECT "District" FROM "table_18249" WHERE "Candidates" = 'Jim Cooper (D) Unopposed'