What party is the person who was first elected in 2000 and was re-elected?
CREATE TABLE "united_states_house_of_representatives_e" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" real,
  "results" text
);
SELECT "party" FROM "united_states_house_of_representatives_e" WHERE "results"='re-elected' AND "first_elected"=2000;