Representative Tim Ryan of Ohio, a Democrat, and J.D. Vance, a Republican, clashed bitterly over issues of ideology and fitness for office in their final debate in the state’s marquee Senate race, as Mr. Ryan painted his opponent as extreme, and Mr. Vance lashed Mr. Ryan as ineffective and more liberal than he lets on.
The contest in a state that former President Donald J. Trump comfortably won twice has remained more competitive than national observers initially expected with Mr. Ryan, a strong fund-raiser, casting himself as an independent voice. Still, he has an uphill climb, and he has not had much assistance so far from national Democrats.
Here are five takeaways from their heated hourlong debate in Youngstown, Ohio:
A strikingly contentious and sometimes personal hour.
The debate crackled with condescension as the two men sparred, reflecting the close nature of the race. At times they referred to each other as “pal,” “our guy” or “buddy.” Mr. Ryan even accused his opponent, in two languages, of being a fraud.
“J.D. Vance, all due respect, is a fraud,” Mr. Ryan said as they discussed immigration. Then he invoked a saying from his “little Italian grandmother” that he said translated into, “‘You have two faces.’ One for the camera, and one for your business dealings.”
Mr. Vance, for his part, argued that Mr. Ryan was only masquerading as a moderate, and that, for all of his years in government, he had not delivered.
Each man tried to saddle the other with the problems of their national parties.
Mr. Vance sought to paint Mr. Ryan as a generic Democrat closely tied to President Biden as well as House Speaker Nancy Pelosi — whom, Mr. Ryan noted, he once challenged for a leadership role.
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“You can’t run from the policies that she supported, that she has shoved down the throat of the people in Ohio,” Mr. Vance said.
Mr. Ryan declared, “If you want to run against Nancy Pelosi, move back to San Francisco and run against Nancy Pelosi,” alluding to Mr. Vance’s time there as a venture capitalist.
Mr. Ryan, for his part, sought to tie Mr. Vance to the far-right congresswoman Marjorie Taylor Greene, who has campaigned with Mr. Vance. And he looked for ways to highlight his independence from his party, saying, for instance, that “I disagree with President Biden when he’s talking about relaxing some of the regulations down on the border, completely disagree with that.”
He also sharply criticized Mr. Vance’s evolution in supporting Mr. Trump. “You were calling Trump America’s Hitler,” he said, adding later that “then he endorsed you and you said he’s the greatest president of all time.”
Mr. Vance disputed the characterization. When he was pressed to name an area of disagreement with Mr. Trump, he expressed concerns with some of the more hawkish members of the administration.
“The thing that was wrong about the Trump administration is they put a lot of people in the administration, a lot of bad personnel folks, who actually advocated limitless nonstop wars,” he said.
A fight over what it means to be extreme on abortion.
Ohio became the center of a debate over abortion rights earlier this year when a 10-year-old girl who had been raped traveled across state lines to receive an abortion because of Ohio’s ban on the procedure in many instances. The issue was a flash point in the debate.
“J.D. and his extreme crew, they want to have a national abortion ban,” Mr. Ryan said as he pushed for codifying Roe v. Wade, which the Supreme Court overturned in June. “They’re not happy with people having to go to Illinois. They want people to get a passport and have to go to Canada. Largest governmental overreach in the history of our lifetime.”
It was language reminiscent of the privacy-focused message used in Kansas by defenders of abortion rights ahead of a ballot measure on the issue this summer.
Mr. Vance has said the 10-year-old should have been able to get an abortion and tried to cast Mr. Ryan as being extreme in his support for abortion rights. He also tried to change the subject by noting that the man who was arrested and charged in the Ohio case was an undocumented immigrant. A spokesman for U.S. Immigration and Customs Enforcement previously confirmed his undocumented status.
Mr. Vance, in an extraordinary leap, tried to pin the blame for the attack on Mr. Ryan: “She would never have been raped in the first place if Tim Ryan had done his job on border security.”
Mr. Vance spoke supportively of Senator Lindsey Graham’s proposed 15-week national abortion ban, but like many Republicans, was reluctant to discuss specifics on abortion exceptions he supported, saying that, for example, while many support exceptions in instances of incest, “an incest exception looks different at three weeks of pregnancy versus 39 weeks of pregnancy.”
A question about “great replacement theory” led to the most raw exchange of the night.
The candidates were asked about a racist conspiracy theory that concerns the notion of white people being replaced by nonwhite people and has helped inspire mass shootings across the country.
Replacement theory has crept into right-wing media, most notably Tucker Carlson’s show on Fox News, where Mr. Vance has been a favorite guest. Mr. Ryan lashed Mr. Vance for spending time with lawmakers who “stoke this racial violence” as he described the role the theory played in the Buffalo mass shooting.
“You are so desperate for political power that you’ll accuse me, the father of three beautiful biracial babies, of engaging in racism,” shot back Mr. Vance, who added that he is “married to the daughter of South Asian immigrants.”
He has warned of an “invasion” from immigrants, and in a campaign ad, suggested loose border policies ensured “more Democrat voters pouring into this country.” But he said on Monday that the issue was not “about whites or nonwhites,” but that he was concerned about illegal immigration. “You can believe in a border without being a racist,” he said.
“I would never talk about your family, J.D.,” Mr. Ryan said. “You don’t want to talk about the fact that you’re with the extremists in that belief.”
“That’s disgusting and I’ve never endorsed it,” Mr. Vance insisted.
Senator Rob Portman was the most popular person onstage.
Mr. Vance and Mr. Ryan are vying to replace Mr. Portman, the center-right Ohio Republican who is retiring — and while he has endorsed Mr. Vance, both invoked him repeatedly.
For Mr. Ryan, doing so signals his interest in bipartisanship. For Mr. Vance, who won the primary with strength from the right, it is a nod to the mainstream.
Mr. Vance repeatedly invoked the endorsement. Mr. Ryan noted times when they have collaborated.
“I’m not quite sure why Rob Portman endorsed you,” Mr. Ryan said at one point. “You don’t agree with any of the compromises that he’s been able to make.”
Trip Gabriel contributed reporting.