What is other when no party preference is 19.1%?
CREATE TABLE "table1_27003186_3" (
  "city" text,
  "population" real,
  "registered_voters" text,
  "democratic" text,
  "republican" text,
  "d_r_spread" text,
  "other" text,
  "no_party_preference" text
);
SELECT "other" FROM "table1_27003186_3" WHERE "no_party_preference"='19.1%';