Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_16751596_13 ( lead_maragin VARCHAR, dates_administered VARCHAR )

### Question ###
On July 17, 2008, what was the total number of lead maragin?

### Accurate SQL ###

SELECT COUNT(lead_maragin) FROM table_16751596_13 WHERE dates_administered = "July 17, 2008"