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

### Instruction:
How many people participated in the Rasmussen Reports poll on October 13, 2010?

### Inputs:
table_name: table, columns: ['Poll source', 'Date(s) administered', 'Sample size', 'Margin of error', 'Jerry Brown (D)', 'Meg Whitman (R)']

### Response:
SELECT Sample size FROM table WHERE Poll source = rasmussen reports AND Date(s) administered = october 13, 2010