Table: election_results_1998_2
Columns: district
incumbent
party
first_elected
results
candidates

Question: What district was John Porter elected in?
SQL: SELECT "district" FROM election_results_1998_2 WHERE "incumbent" = 'John Porter'

Question: What was the result in Illinois 7?
SQL: SELECT "results" FROM election_results_1998_2 WHERE "district" = 'Illinois 7'

Question: Who were the candidates in the district where Jerry Costello won?
SQL: SELECT "candidates" FROM election_results_1998_2 WHERE "incumbent" = 'Jerry Costello'