CREATE TABLE table_18507 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

What party's candidate was re-elected in the Louisiana 6 district?
SELECT "Party" FROM table_18507 WHERE "Result" = 'Re-elected' AND "District" = 'Louisiana 6'
SELECT "Party" FROM "table_18507" WHERE "District" = 'Louisiana 6' AND "Result" = 'Re-elected'