CREATE TABLE table_20750731_1 (obama_number INT, mccain_percentage VARCHAR)

What is the Obama# when McCain% is 64.4%?
SELECT MAX(obama_number) FROM table_20750731_1 WHERE mccain_percentage = "64.4%"
SELECT MAX("obama_number") FROM "table_20750731_1" WHERE "64.4%" = "mccain_percentage"