1978Flipped from DemocraticFinal resultsIncumbent defeated
1978 election for Ohio Senate District 15
Ohio State Senate · Ohio
John Kasich (R) won with 55.9% of the vote, defeating Robert E. Oshaughnessy (D) by 11.8 points, a seat Democrats won last time.
John KasichRepublican · winner
55.9%54,193
Robert E. OshaughnessyDemocrat · incumbent
44.1%42,734
96,927 votes
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET
The seat over time
D − R margin in this seat's races around 1978
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET