CREATE TABLE table_18278 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

Which district shows a first elected of 1980?
SELECT "District" FROM table_18278 WHERE "First elected" = '1980'
SELECT "District" FROM "table_18278" WHERE "First elected" = '1980'