CREATE TABLE table_23641 ("County" TEXT, "Obama %" TEXT, "Obama #" FLOAT, "McCain %" TEXT, "McCain #" FLOAT, "Others %" TEXT, "Others #" FLOAT)

What percentage of voters chose McCain in the county where 2.1% of voters voted third party?
SELECT "McCain %" FROM table_23641 WHERE "Others %" = '2.1%'
SELECT "McCain %" FROM "table_23641" WHERE "Others %" = '2.1%'