| Years Served | Party | Answer | % Correct |
|---|---|---|---|
| 1937 - 1939 | Democrat | Barzilla W. Clark | 100%
|
| 2019 - Present | Republican | Brad Little | 100%
|
| 2007 - 2019 | Republican | Butch Otter | 100%
|
| 1939 - 1941 | Republican | C. A. Bottolfsen | 100%
|
| 1943 - 1945 | Republican | C. A. Bottolfsen | 100%
|
| 1947 - 1951 | Republican | C. A. Robins | 100%
|
| 1931 - 1937 | Democrat | C. Ben Ross | 100%
|
| 1971 - 1977 | Democrat | Cecil Andrus | 100%
|
| 1987 - 1995 | Democrat | Cecil Andrus | 100%
|
| 1945 | Democrat | Charles C. Gossett | 100%
|
| 1941 - 1943 | Democrat | Chase A. Clark | 100%
|
| 1967 - 1971 | Republican | Don Samuelson | 100%
|
| 1919 - 1923 | Republican | D. W. Davis | 100%
|
| 1905 - 1909 | Republican | Frank R. Gooding | 100%
|
| 1897 - 1901 | Democrat | Frank Steunenberg | 100%
|
| 1901 - 1903 | Democrat | Frank W. Hunt | 100%
|
| 1890 | Republican | George L. Shoup | 100%
|
| 1909 - 1911 | Republican | James H. Brady | 100%
|
| 1911 - 1913 | Democrat | James H. Hawley | 100%
|
| 2006 - 2007 | Republican | Jim Risch | 100%
|
| 1951 - 1955 | Republican | Leonard B. Jordan | 100%
|
| 1915 - 1919 | Democrat | Moses Alexander | 100%
|
| 1890 - 1893 | Republican | N. B. Willey | 100%
|
| 1995 - 1999 | Republican | Phil Batt | 100%
|
| 1955 - 1967 | Republican | Robert E. Smylie | 100%
|
| 1893 - 1897 | Republican | William J. McConnell | 100%
|
| 1945 - 1947 | Democrat | Arnold Williams | 0%
|
| 1923 - 1927 | Republican | Charles C. Moore | 0%
|
| 1999 - 2006 | Republican | Dirk Kempthorne | 0%
|
| 1927 - 1931 | Republican | H. C. Baldridge | 0%
|
| 1977 - 1987 | Democrat | John Evans | 0%
|
| 1913 - 1915 | Republican | John M. Haines | 0%
|
| 1903 - 1905 | Republican | John T. Morrison | 0%
|