CREATE TABLE table_18344 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

In which district is the incumbent John Breaux?
SELECT "District" FROM table_18344 WHERE "Incumbent" = 'John Breaux'
SELECT "District" FROM "table_18344" WHERE "Incumbent" = 'John Breaux'