When is the first elected in the Florida 19 district?
CREATE TABLE "table1_1805191_10" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" real,
  "results" text,
  "candidates" text
);
SELECT "first_elected" FROM "table1_1805191_10" WHERE "district"='Florida 19';