Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| District | Incumbent | Party | First elected | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| Ohio 1 | Tom Luken | Democratic | 1974.0 | Lost re-election Republican gain | Bill Gradison (R) 50.9% Tom Luken (D) 49.1% |
| Ohio 3 | Charles W. Whalen, Jr. | Republican | 1966.0 | Re-elected | Charles W. Whalen, Jr. (R) Unopposed |
| Ohio 5 | Del Latta | Republican | 1958.0 | Re-elected | Del Latta (R) 62.5% Bruce Edwards (D) 37.5% |
| Ohio 6 | Bill Harsha | Republican | 1960.0 | Re-elected | Bill Harsha (R) 68.8% Lloyd Allan Wood (D) 31.2% |
| Ohio 12 | Samuel L. Devine | Republican | 1958.0 | Re-elected | Samuel L. Devine (R) 50.9% Fran Ryan (D) 49.1% |
| Ohio 16 | Ralph Regula | Republican | 1972.0 | Re-elected | Ralph Regula (R) 65.6% John G. Freedom (D) 34.4% |
| Ohio 18 | Wayne L. Hays | Democratic | 1948.0 | Re-elected | Wayne L. Hays (D) 65.6% Ralph H. Romig (R) 34.4% |
| Ohio 21 | Louis Stokes | Democratic | 1968.0 | Re-elected | Louis Stokes (D) 82.0% Bill Mack (R) 18.0% |
Question:
Who were the candidates in the districts that was first elected in 1966?
Answer:
Charles W. Whalen, Jr. (R) Unopposed