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

### Instruction:
Which organization administered the poll that showed a lead margin of 5.5?

### Inputs:
table_name: table, columns: ['Poll Source', 'Dates administered', 'Democrat: Mary Landrieu', 'Republican: John Kennedy', 'Lead Margin']

### Response:
SELECT Poll Source FROM table WHERE Lead Margin = 5.5