Either Trump had confused Stivers with state Sen.
He questioned the idea that the party that controls the White House suffers in the midterm elections.
He also gave an onstage hug to Rep. Jim Jordan, who is under siege after allegations that, as an assistant wrestling coach at Ohio State University, he knew of alleged sexual abuse by a team doctor but did not report it. Jordan, who has denied the charge, has announced his plan to run for speaker of the House.
Trump called Balderson "the guy who will do things" and dismissed O'Connor as a person nobody knows.
Hundreds of people are slowly making their way into an OH high school ahead of a rally headlined by President Donald Trump. But with House Speaker Paul Ryan, Vice President Mike Pence, and even President Trump showing up in Ohio's 12th Congressional District in recent days, it's obvious that Republicans are very concerned about losing Tuesday's special election, the last before voters head to the polls in November.
O'Connor supporters are 16 percentage points more likely to say they have a lot of interest in this election than Balderson's.
Hundreds of people are slowly making their way into an the high school for the rally and a few dozen protesters are lined along a walkway outside the school holding signs that say "Impeach 45" and "Real News Fake President". "The President?' He said, 'No, I didn't, '" Kasich responded.
Democrats have "a weak candidate because there's no message", he declared.
The Ohio rally was Trump's third of the week and he has pledged to accelerate his pace further as the midterms approach.
Trump relished playing the role of Republican kingmaker, bragging how the GOP candidates he's opposed, like Rep. Mark Sanford of SC, have lost.
The congressional seat has been vacant since January, when nine-term congressman Patrick Tiberi resigned.
The rally comes hours after Trump denounced arguably Ohio's favorite native son, basketball superstar LeBron James, who just opened a school for underprivileged children in Akron.