What is the maximum McCain population turnout number?
CREATE TABLE table_20684390_1 (mccain_number INTEGER)
SELECT MAX(mccain_number) FROM table_20684390_1
### Context: CREATE TABLE table_20684390_1 (mccain_number INTEGER) ### Question: What is the maximum McCain population turnout number? ### Answer: SELECT MAX(mccain_number) FROM table_20684390_1