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Wisconsin was admitted to the Union on May 29, 1848.
[edit] Class I
| Senator |
Party |
Took office |
Left office |
Reason |
Notes |
| Henry Dodge |
 |
Democratic |
June 8, 1848 |
March 4, 1857 |
|
Governor of the Wisconsin Territory (1836–1841; 1845–1848) |
| James R. Doolittle |
 |
Republican |
March 4, 1857 |
March 4, 1869 |
|
|
| Matthew H. Carpenter |
 |
Republican |
March 4, 1869 |
March 4, 1875 |
Lost re-election |
Also served in Wisconsin's class III seat |
| Angus Cameron |
 |
Republican |
March 4, 1875 |
March 4, 1881 |
Retired |
Speaker of the Michigan House of Representatives (1867)
Also served in Wisconsin's class III seat |
| Philetus Sawyer |
 |
Republican |
March 4, 1881 |
March 4, 1893 |
Retired |
|
| John L. Mitchell |
 |
Democratic |
March 4, 1893 |
March 4, 1899 |
Retired |
|
| Joseph V. Quarles |
 |
Republican |
March 4, 1899 |
March 4, 1905 |
Retired |
|
| Robert M. La Follette, Sr. |
 |
Republican |
January 2, 1906 |
June 18, 1925 |
Died |
Governor of Wisconsin (1901–1906) |
| Robert M. La Follette, Jr. |
 |
Republican |
September 30, 1925 |
January 3, 1947 |
Lost renomination |
|
| Progressive |
| Republican |
| Joseph R. McCarthy |
 |
Republican |
January 3, 1947 |
May 2, 1957 |
Died |
|
| William Proxmire |
 |
Democratic |
August 28, 1957 |
January 3, 1989 |
Retired |
|
| Herb Kohl |
 |
Democratic |
January 3, 1989 |
Incumbent |
|
|
[edit] Class III
| Senator |
Party |
Took office |
Left office |
Reason |
Notes |
| Isaac P. Walker |
 |
Democratic |
June 8, 1848 |
March 4, 1855 |
|
|
| Charles Durkee |
 |
Republican |
March 4, 1855 |
March 4, 1861 |
|
Governor of the Utah Territory (1865–1869) |
| Free Soil |
| Timothy O. Howe |
 |
Republican |
March 4, 1861 |
March 4, 1879 |
Lost re-election |
U.S. Postmaster General (1881–1883) |
| Matthew H. Carpenter |
 |
Republican |
March 4, 1879 |
February 24, 1881 |
Died |
Also served in Wisconsin's class I seat |
| Angus Cameron |
 |
Republican |
March 14, 1881 |
March 4, 1885 |
Retired |
Also served in Wisconsin's class I seat |
| John Coit Spooner |
 |
Republican |
March 4, 1885 |
March 4, 1891 |
Lost re-election |
|
| William F. Vilas |
 |
Democratic |
March 4, 1891 |
March 4, 1897 |
Lost renomination |
Secretary of the Interior (1888–1889)
U.S. Postmaster General (1885–1888) |
| John Coit Spooner |
 |
Republican |
March 4, 1897 |
April 30, 1907 |
Resigned |
|
| Isaac Stephenson |
 |
Republican |
May 17, 1907 |
March 4, 1915 |
|
|
| Paul O. Husting |
 |
Democratic |
March 4, 1915 |
October 21, 1917 |
Died |
|
| Irvine Lenroot |
 |
Republican |
April 18, 1918 |
March 4, 1927 |
Lost renomination |
Speaker of the Michigan House of Representatives (1903–1907) |
| John J. Blaine |
 |
Republican |
March 4, 1927 |
March 4, 1933 |
Lost renomination |
Governor of Wisconsin (1921–1927) |
| F. Ryan Duffy |
|
Democratic |
March 4, 1933 |
January 3, 1939 |
Lost re-election |
Circuit Judge, 7th Circuit Court of Appeals |
| Alexander Wiley |
 |
Republican |
January 3, 1939 |
January 3, 1963 |
Lost re-election |
|
| Gaylord A. Nelson |
 |
Democratic |
January 8, 1963 |
January 3, 1981 |
|
Governor of Wisconsin (1959–1962) |
| Robert W. Kasten, Jr. |
 |
Republican |
January 3, 1981 |
January 3, 1993 |
Lost re-election |
|
| Russ Feingold |
 |
Democratic |
January 3, 1993 |
Incumbent |
|
|
[edit] See also
United States congressional delegations from Vermont
|
United States Senators from Wisconsin |
|
| Class 1 |
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 |
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| Class 3 |
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