How many people voted in Cabarrus county?
CREATE TABLE "by_county" (
  "county" text,
  "obamapct" text,
  "obamanum" real,
  "mc_cainpct" text,
  "mc_cainnum" real,
  "total" real
);
SELECT MIN("total") FROM "by_county" WHERE "county"='Cabarrus';