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

### Instruction:
What is the percentage for Mel Martinez when the sample size is 800?

### Inputs:
table_name: table, columns: ['Poll Source', 'Date(s) administered', 'Sample size', 'Margin of Error', 'Mel Martinez (R)', 'Betty Castor (D)']

### Response:
SELECT Mel Martinez (R) FROM table WHERE Sample size = 800