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| 1978 Illinois U.S. Senate Election | |||||
|---|---|---|---|---|---|
| Party | Candidate | Votes | % | ±% | |
| Democratic | Alex Seith | 1,448,187 | |||
| Republican | Charles H. Percy | 1,698,711 | |||
| Libertarian | Bruce Lee Green | 16,320 | |||
| Socialist Workers | Patricia Grogan | 15,922 | |||
| Socialist Labor | Gerald Rose | 5,465 | |||
| Write-in | 159 | ||||
| Majority | |||||
| Turnout | |||||
| Republican hold | Swing | ||||