What percentage of the vote did McCain win in Waynesboro (city)?
CREATE TABLE "by_county_city" (
  "county" text,
  "obamapct" text,
  "obamanum" real,
  "mc_cainpct" text,
  "mc_cainnum" real
);
SELECT "mc_cainpct" FROM "by_county_city" WHERE "county"='Waynesboro (city)';