What is the lowest Took Office, when Senator is Eddie Bernice Johnson, and when District is greater than 23?
CREATE TABLE "senate" (
  "senator" text,
  "party" text,
  "district" real,
  "home_town" text,
  "took_office" real
);
SELECT MIN("took_office") FROM "senate" WHERE "senator"='eddie bernice johnson' AND "district">23;