How many different lead margins were stated in the poll administered on September 11, 2008?
CREATE TABLE table_17538810_10 (
    lead_margin VARCHAR,
    dates_administered VARCHAR
)
SELECT COUNT(lead_margin) FROM table_17538810_10 WHERE dates_administered = "September 11, 2008"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many different lead margins were stated in the poll administered on September 11, 2008? ### Input: CREATE TABLE table_17538810_10 (
    lead_margin VARCHAR,
    dates_administered VARCHAR
) ### Response: SELECT COUNT(lead_margin) FROM table_17538810_10 WHERE dates_administered = "September 11, 2008"