CREATE TABLE table_16601 ("No." FLOAT, "Episode" TEXT, "Air Date" TEXT, "Timeslot" TEXT, "Rating" TEXT, "Share" TEXT, "18\\u201349  ( Rating/Share ) " TEXT, "Viewers  ( m ) " TEXT, "Rank  ( # ) " TEXT)

What's the rating of the episode originally aired on May 5, 2009?
SELECT "Rating" FROM table_16601 WHERE "Air Date" = 'May 5, 2009'
SELECT "Rating" FROM "table_16601" WHERE "Air Date" = 'May 5, 2009'