Table: election_results_1974_4
Columns: district
incumbent
party
first_elected
result
candidates

Question: Name the candidates for texas 1
SQL: SELECT "candidates" FROM election_results_1974_4 WHERE "district" = 'Texas 1'

Question: Name the incumbent for district texas 12
SQL: SELECT "incumbent" FROM election_results_1974_4 WHERE "district" = 'Texas 12'

Question: Name the candidates for texas 20
SQL: SELECT "candidates" FROM election_results_1974_4 WHERE "district" = 'Texas 20'