CREATE TABLE table_23746 ("County" TEXT, "Obama%" TEXT, "Obama#" FLOAT, "McCain%" TEXT, "McCain#" FLOAT, "Total" FLOAT)

What percentage of the votes did Obama get in the county where 3909 people voted in total?
SELECT "Obama%" FROM table_23746 WHERE "Total" = '3909'
SELECT "Obama%" FROM "table_23746" WHERE "Total" = '3909'