CREATE TABLE "united_states_house_of_representatives_e" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" real,
  "result" text,
  "candidates" text
);

Question: who is the incumbent with candidates being bud shuster (r) unopposed
SQL: SELECT "incumbent" FROM "united_states_house_of_representatives_e" WHERE "candidates"='Bud Shuster (R) Unopposed';

Question: who is the incumbent with candidates being tom ridge (r) 80.9% joylyn blackwell (d) 19.1%
SQL: SELECT "incumbent" FROM "united_states_house_of_representatives_e" WHERE "candidates"='Tom Ridge (R) 80.9% Joylyn Blackwell (D) 19.1%';

Question: what's district with candidates being curt weldon (r) 61.3% bill spingler (d) 38.7%
SQL: SELECT "district" FROM "united_states_house_of_representatives_e" WHERE "candidates"='Curt Weldon (R) 61.3% Bill Spingler (D) 38.7%';

Question: what's party with district being pennsylvania 21
SQL: SELECT "party" FROM "united_states_house_of_representatives_e" WHERE "district"='Pennsylvania 21';

Question: what is the maximum first elected with incumbent being gus yatron
SQL: SELECT MAX("first_elected") FROM "united_states_house_of_representatives_e" WHERE "incumbent"='Gus Yatron';

Question: what's the district with first elected being 1972
SQL: SELECT "district" FROM "united_states_house_of_representatives_e" WHERE "first_elected"=1972;