How many parties won the election in the California 23 district?
CREATE TABLE "table1_1341690_5" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" real,
  "result" text,
  "candidates" text
);
SELECT COUNT("party") FROM "table1_1341690_5" WHERE "district"='California 23';