CREATE TABLE table_20468206_1 (obama_number NUMBER, mccain_percentage VARCHAR2)

Name the most obama number for mccain being 38.86%
SELECT MAX(obama_number) FROM table_20468206_1 WHERE mccain_percentage = "38.86%"
SELECT MAX("obama_number") FROM "table_20468206_1" WHERE "38.86%" = "mccain_percentage"