What is the date of the poll with Silbert at 18%?
CREATE TABLE table_name_53 (date VARCHAR, silbert VARCHAR)
SELECT date FROM table_name_53 WHERE silbert = "18%"
### Context: CREATE TABLE table_name_53 (date VARCHAR, silbert VARCHAR) ### Question: What is the date of the poll with Silbert at 18%? ### Answer: SELECT date FROM table_name_53 WHERE silbert = "18%"