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

### Instruction:
When 30% is scott mcadams (d) percentage how many poll sources are there?

### Inputs:
table_name: table, columns: ['Poll source', 'Dates administered', 'Joe Miller (R)', 'Lisa Murkowski (R) write-in candidate *', 'Scott McAdams (D)']

### Response:
SELECT COUNT Poll source FROM table WHERE Scott McAdams (D) = 30%