CREATE TABLE table_13874 ("Rank" FLOAT, "Date" TEXT, "Attendance" FLOAT, "Opponent" TEXT, "Florida Result" TEXT)

Which Opponent is on september 9, 2004?
SELECT "Opponent" FROM table_13874 WHERE "Date" = 'september 9, 2004'
SELECT "Opponent" FROM "table_13874" WHERE "Date" = 'september 9, 2004'