Table: election_results_1974_3
Columns: district
incumbent
party
first_elected
result
candidates

Question: Who were the candidates in the district won by the incumbent Del Latta?
SQL: SELECT "candidates" FROM election_results_1974_3 WHERE "incumbent" = 'Del Latta'

Question: Who were the candidates in the districts that was first elected in 1966?
SQL: SELECT "candidates" FROM election_results_1974_3 WHERE "first_elected" = 1966