| Year(s) | Party | Senator | % Correct |
|---|---|---|---|
| 1999- | Republican | Mike Crapo | 100%
|
| 2009- | Republican | Jim Risch | 88%
|
| 1991-2009 | Republican | Larry Craig | 75%
|
| 1957-1981 | Democratic | Frank Church | 69%
|
| 1907-1940 | Republican | William Borah | 69%
|
| 1945-1946 | Democratic | Charles C. Gossett | 56%
|
| 1993-1999 | Republican | Dirk Kempthorne | 56%
|
| 1939-1945 | Democratic | D. Worth Clark | 56%
|
| 1921-1928 | Republican | Frank Gooding | 56%
|
| 1945-1951 | Democratic | Glen H. Taylor | 56%
|
| 1946-1949; 1949-1962 | Republican | Henry Dworshak | 56%
|
| 1897-1903 | Populist | Henry Heitfeld | 56%
|
| 1951-1957 | Republican | Herman Welker | 56%
|
| 1933-1939 | Democratic | James Pope | 56%
|
| 1973-1991 | Republican | Jim McClure | 56%
|
| 1928-1933; 1940-1945 | Republican | John W. Thomas | 56%
|
| 1962-1973 | Republican | Len Jordan | 56%
|
| 1981-1993 | Republican | Steve Symms | 56%
|
| 1903-1912 | Republican | Weldon Heyburn | 56%
|
| 1890-1891 | Republican | William McConnell | 56%
|
| 1949 | Democratic | Bert H. Miller | 50%
|
| 1891-1897; 1901-1907 | Democratic | Fred Dubois | 50%
|
| 1890-1901 | Republican | George Shoup | 50%
|
| 1913-1918 | Republican | James Brady | 50%
|
| 1918-1921 | Democratic | John Nugent | 50%
|
| 1912-1913 | Democratic | Kirtland Perky | 50%
|