Republican Dave Yost has defeated Democrat John Patrick Carney to win a second term as Ohio's state auditor.
Yost had been seen as one of the year's most vulnerable incumbents, after winning by a narrow margin four years ago.
He elevated the office's profile during his four-year term through efforts to audit Republican Gov. John Kasich's privatized job-creation office, JobsOhio, and through a statewide investigation of potential attendance tampering at public schools across Ohio.
Preliminary results of exit polls have found that about half of the voters in Ohio are giving President Barack Obama a failing grade for his job performance.
Also, about half of Ohioans say they think Obama's federal health care law went too far while just 2 in 5 thought it didn't do enough.
But about half say Ohio Republican Gov. John Kasich has done a good job of handling implementation of the law. The governor has been criticized by some conservatives over his decision to expand Medicaid under the new law. He faced Democrat Ed FitzGerald.