CREATE TABLE table_75618 ("Source" TEXT, "Date" TEXT, "Goldberg" TEXT, "Murray" TEXT, "Silbert" TEXT, "Undecided" TEXT)

What is the date of the poll where Murray had 11% from the Suffolk University source?
SELECT "Date" FROM table_75618 WHERE "Source" = 'suffolk university' AND "Murray" = '11%'
SELECT "Date" FROM "table_75618" WHERE "Murray" = '11%' AND "Source" = 'suffolk university'