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

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'