Table: election_results_1868
Columns: district
incumbent
party
first_elected
result
candidates

Question: When was incumbent John Thomas Wilson first elected? 
SQL: SELECT "first_elected" FROM election_results_1868 WHERE "incumbent" = 'John Thomas Wilson'

Question: Who were the candidates in the election where John Beatty was the incumbent? 
SQL: SELECT "candidates" FROM election_results_1868 WHERE "incumbent" = 'John Beatty'

Question: Who was the incumbent in the Ohio 16 district? 
SQL: SELECT "incumbent" FROM election_results_1868 WHERE "district" = 'Ohio 16'