CREATE TABLE table_18389 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What district did Joe Waggonner belong to?
SELECT "District" FROM table_18389 WHERE "Incumbent" = 'Joe Waggonner'
SELECT "District" FROM "table_18389" WHERE "Incumbent" = 'Joe Waggonner'