What is % of All, when Dennis Kucinich is "5%"?
CREATE TABLE "exit_polling" (
  "classification" text,
  "pct_of_all" text,
  "john_kerry" text,
  "john_edwards" text,
  "dennis_kucinich" text
);
SELECT "pct_of_all" FROM "exit_polling" WHERE "dennis_kucinich"='5%';