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

### Instruction:
On what date was the poll showing John Kennedy with 45% and Mary Landrieu with 38%?

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

### Response:
SELECT Dates administered FROM table WHERE Republican: John Kennedy = 45% AND Democrat: Mary Landrieu = 38%