Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many different lead margins were stated in the poll administered on September 11, 2008?

### Inputs:
table_name: table, columns: ['Poll Source', 'Dates administered', 'Democrat: Jay Nixon', 'Republican: Kenny Hulshof', 'Lead Margin']

### Response:
SELECT COUNT Lead Margin FROM table WHERE Dates administered = September 11, 2008