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The1912 Illinois lieutenant gubernatorial election was held on November 5, 1912.Incumbent first-termRepublicanlieutenant governorJohn G. Oglesby was defeated byDemocratic nomineeBarratt O'Hara.
Primary elections were held on April 9, 1912.
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Barratt O'Hara | 56,518 | 21.65 | |
| Democratic | Frank D. Comerford | 54,321 | 20.80 | |
| Democratic | Charles C. Craig | 48,034 | 18.40 | |
| Democratic | Gustavus T. Tatge | 36,371 | 13.93 | |
| Democratic | William E. Golden | 24,644 | 9.44 | |
| Democratic | J. L. Pickering, Sr. | 24,427 | 9.36 | |
| Democratic | Adlai T. Ewing | 16,792 | 6.43 | |
| Total votes | 261,107 | 100.00 | ||
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | John G. Oglesby (incumbent) | 275,626 | 72.47 | |
| Republican | Reuben R. Tiffany | 74,198 | 19.51 | |
| Republican | Kinnie A. Ostewig | 30,498 | 8.02 | |
| Total votes | 380,322 | 100.00 | ||
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Prohibition | Jacob H. Hoofstitler | 3,547 | 100.00 | |
| Total votes | 3,547 | 100.00 | ||
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Socialist | F. T. Maxwell | 8,026 | 100.00 | |
| Total votes | 8,026 | 100.00 | ||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Democratic | Barratt O'Hara | 407,243 | 40.91% | ||
| Republican | John G. Oglesby (incumbent) | 316,813 | 27.75% | ||
| Progressive | Dean Franklin | 315,589 | 27.64% | ||
| Socialist | F. T. Maxwell | 82,655 | 7.24% | ||
| Prohibition | Jacob H. Hoofstitler | 15,342 | 1.34% | ||
| Socialist Labor | Gottlieb Renner | 4,121 | 0.36% | ||
| Majority | 90,430 | 7.92% | |||
| Turnout | 1,141,763 | 100.00% | |||
| Democraticgain fromRepublican | Swing | ||||