CREATE TABLE table_23809 ("Date of opinion poll" TEXT, "Conductor" TEXT, "Sample size" FLOAT, "For" TEXT, "Against" TEXT, "Undecided" TEXT)

When was the poll that showed 54% for and 22% undecided conducted?
SELECT "Date of opinion poll" FROM table_23809 WHERE "For" = '54%' AND "Undecided" = '22%'
SELECT "Date of opinion poll" FROM "table_23809" WHERE "For" = '54%' AND "Undecided" = '22%'