What is the description of the measure that got 78.27% yes votes?
CREATE TABLE "1970_general_election" (
  "meas_num" real,
  "passed" text,
  "yes_votes" real,
  "no_votes" real,
  "pct_yes" text,
  "const_amd" text,
  "type" text,
  "description" text
);
SELECT "description" FROM "1970_general_election" WHERE "pct_yes"='78.27%';