Table: election_results_1966_2
Columns: district
incumbent
party
first_elected
result
candidates

Question: Who's the incumbent of Indiana 4 district?
SQL: SELECT "incumbent" FROM election_results_1966_2 WHERE "district" = 'Indiana 4'

Question: Who's the incumbent of the district with first election held in 1950?
SQL: SELECT "incumbent" FROM election_results_1966_2 WHERE "first_elected" = '1950'