Table: election_results_1988_6
Columns: district
incumbent
party
first_elected
result
candidates

Question: Who were the candidates when Lamar S. Smith was incumbent?
SQL: SELECT "candidates" FROM election_results_1988_6 WHERE "incumbent" = 'Lamar S. Smith'

Question: What party did Beau Boulter represent?
SQL: SELECT "party" FROM election_results_1988_6 WHERE "incumbent" = 'Beau Boulter'

Question: Who were the candidates when Jack Fields was the incumbent?
SQL: SELECT "candidates" FROM election_results_1988_6 WHERE "incumbent" = 'Jack Fields'