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

### Instruction:
What were the dates administered when the lead margin was smaller than 39 with Republican Christopher Reed at 37% and Democrat Tom Harkin at 53%?

### Inputs:
table_name: table, columns: ['Poll Source', 'Dates administered', 'Democrat: Tom Harkin', 'Republican: Christopher Reed', 'Lead Margin']

### Response:
SELECT Dates administered FROM table WHERE Lead Margin < 39 AND Republican: Christopher Reed = 37% AND Democrat: Tom Harkin = 53%