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

### Instruction:
Who got the pole position if the supporting is USAC National Midget Series?

### Inputs:
table_name: table, columns: ['Round', 'Circuit', 'Location', 'Date', 'Pole position', 'Fastest lap', 'Winning driver', 'Winning team', 'Supporting']

### Response:
SELECT Pole position FROM table WHERE Supporting = USAC National Midget Series