CREATE TABLE table_18288 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

Who were the candidates in the Louisiana 4 district?
SELECT "Candidates" FROM table_18288 WHERE "District" = 'Louisiana 4'
SELECT "Candidates" FROM "table_18288" WHERE "District" = 'Louisiana 4'