CREATE TABLE table_18404 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

How many candidates were elected in the Louisiana 4 district?
SELECT COUNT("First elected") FROM table_18404 WHERE "District" = 'Louisiana 4'
SELECT COUNT("First elected") FROM "table_18404" WHERE "District" = 'Louisiana 4'