CREATE TABLE table_18537 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

what is the minimum number first elected to district louisiana 5?
SELECT MIN("First elected") FROM table_18537 WHERE "District" = 'Louisiana 5'
SELECT MIN("First elected") FROM "table_18537" WHERE "District" = 'Louisiana 5'