CREATE TABLE table_23936 ("County" TEXT, "Obama%" TEXT, "Obama#" FLOAT, "McCain%" TEXT, "McCain#" FLOAT)

How many people voted for Obama in the county where McCain got 72.75% of the votes?
SELECT MIN("Obama#") FROM table_23936 WHERE "McCain%" = '72.75%'
SELECT MIN("Obama#") FROM "table_23936" WHERE "McCain%" = '72.75%'