CREATE TABLE table_27714985_1 (original_air_date VARCHAR, us_viewers__millions_ VARCHAR)

What was the broadcast date of episodes that were watched by 23.2 million viewers?
SELECT original_air_date FROM table_27714985_1 WHERE us_viewers__millions_ = "23.2"
SELECT "original_air_date" FROM "table_27714985_1" WHERE "23.2" = "us_viewers__millions_"