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

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

### Inputs:
table_name: table, columns: ['Poll Source', 'Dates administered', 'Democrat: Mark Begich', 'Republican: Ted Stevens', 'Lead Maragin']

### Response:
SELECT COUNT Lead Maragin FROM table WHERE Dates administered = July 17, 2008