CREATE TABLE table_18287 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Who's the incumbent of the Louisiana 1 district?
SELECT "Incumbent" FROM table_18287 WHERE "District" = 'Louisiana 1'
SELECT "Incumbent" FROM "table_18287" WHERE "District" = 'Louisiana 1'