CLEVELAND — When Tim Ryan speaks to Democratic crowds in the closing days of the Ohio Senate race, his biggest applause line is about the other team.
A Republican official in a “deep-red county,” he recounts, his voice dropping to a stage whisper, told him, “You have no idea how many Republicans are going to quietly vote for you.”
The hoots and hollers that break out represent the high hopes of a party that has lost much of its appeal to working-class voters and that sees in Mr. Ryan — a congressman from the Mahoning Valley who has an anti-China, pro-manufacturing message and whose own father is a Republican — a chance to claw back blue-collar credibility.
Polls show Mr. Ryan competing within the margin of error against his Republican opponent, J.D. Vance. Mr. Ryan is polling higher than President Biden’s job approval rating in Ohio surveys, and he is outperforming the Democratic candidate for governor, Nan Whaley. That suggests a potentially sizable pool of voters who intend to split their tickets between a Republican for governor and a Democrat for Senate.
“This is going to be the upset of the night,” Mr. Ryan said in an interview on his campaign bus on Thursday, as he plied the pro-Democrat shoreline of Lake Erie from Toledo to Cleveland.
“There’s a lot of Republicans who would never tell a pollster that they’re voting for me,” he said. “They don’t want to put a yard sign up. They don’t want to get in a fight with the neighbor who’s got the ‘Let’s Go Brandon’ flag.”
He said his internal polling showed 12 percent or more of Republicans “coming our way.”
But there is also the cold reality of a midterm environment tilting against Democrats almost everywhere, with inflation the top voter concern. Polling in Ohio in recent elections has undercounted the backing for Republican candidates. And there has been a political realignment of Ohio voters in the past decade, which has largely pushed the state off the battleground map.
White Ohioans without college degrees have shifted toward Republicans up and down the ballot, while suburban, college-educated voters have moved to favor Democrats, though less consistently.
“Ohio is a much more Republican state than Texas is,” said Mike Hartley, a Republican strategist with 25 years of experience in Ohio. “Democrats talk about things that for a lot of Ohioans offends their core principles and sensibilities, and they run away from the pocketbook issues.”
The State of the 2022 Midterm Elections
Election Day is Tuesday, Nov. 8.
Former President Donald J. Trump twice won Ohio with ease by appealing to the economic and cultural anxieties of working-class white voters. In 2020, he grew his support in the state’s industrial northeast — Mr. Ryan’s base — and became the first Republican presidential candidate in 50 years to win Mahoning County, which is home to Youngstown.
Bob Paduchik, chairman of the Republican Party of Ohio, brushed off the notion of quiet Republican support for Mr. Ryan. He said county-level absentee voting data and an analysis using Republican National Committee modeling predicted a clean Vance victory.
“I don’t know what he thinks he’s looking at,” he said of Mr. Ryan’s assertion of hidden support. “But I’ll take our data, which is based on the R.N.C. modeling, which has hundreds of millions of dollars invested in it.”
Despite Mr. Trump’s success in Ohio, Democrats point to the example of Senator Sherrod Brown, a Democrat and gruff-voiced champion of organized labor who won re-election in 2018 by appealing to working-class voters who might not have liked his progressive social priorities, but believed he would fight for their jobs.
Mr. Ryan, casting himself partly in the Brown mold, is the grandson of a steelworker and a longtime opponent of trade deals that hurt American factories. He has said that President Biden should not seek re-election and he opposed Nancy Pelosi for House speaker. A former college quarterback, he appears in his ads throwing darts in a bar or footballs at TV sets. “You want culture wars? I’m not your guy,” he says.
Mr. Ryan pitches himself to voters weary of the divisiveness and anger broiling in America. “I have this conversation with my dad all the time,” he said in the interview, adding that his father “probably” voted for Mr. Trump, twice.
“People are tired of the insanity,” Mr. Ryan told a gathering of Democratic activists on the shore of Lake Erie in Sandusky on Thursday. “We’re Ohio. Ohio doesn’t do crazy.”
It was a sideswipe at Mr. Vance, who has campaigned with the far-right Representative Marjorie Taylor Greene of Georgia, has flirted with the conspiracy theory that Democrats want to “replace” existing voters with immigrants and has defended Alex Jones as “more reputable” than an MSNBC host.
On Friday, speaking to supporters at the county Republican headquarters in Canton, Mr. Vance portrayed his opponent as disingenuous in claiming to be a new-model Democrat. Mr. Vance joked that “maybe we should have invited Tim Ryan” because of the Democrat’s efforts to distance himself from his own party.
“This guy is not the moderate that he pretends to be,” Mr. Vance continued. “He’s a guy who bends the knee to Nancy Pelosi and does what he’s told.”
One sign that Mr. Ryan remains a long shot is the lack of TV advertising from big-spending groups tied to the Democratic Senate leadership, which have poured tens of millions of dollars into races elsewhere.
Mr. Ryan has compensated by raising a staggering $39 million on his own. The money flowed from small donors around the country, many annoyed by Mr. Vance’s political evolution, from the “Hillbilly Elegy” author who denounced Mr. Trump in 2016 as “cultural heroin” to a stalwart Trump supporter. At a rally in Ohio last month, the former president joked that Mr. Vance “is kissing my ass” to win his support.
Mr. Trump is scheduled to return to the state the day before the election for a rally with Mr. Vance in Dayton. Asked at a brief news conference on Friday whether he needed a boost from the former president, Mr. Vance said: “I like the president. I thought his policies deliver prosperity for the state of Ohio, and he wants to come to Ohio, and we’d love to have him in Ohio. It’s really that simple.”
Unlike Mr. Ryan, who has shunned campaigning with national Democratic figures, Mr. Vance has embraced national G.O.P. leaders, appearing in Canton with the Republican National Committee chairwoman, Ronna McDaniel, and Senator Rick Scott of Florida, the chairman of the Republican Senate campaign arm.
Mr. Vance has largely relied on the Republican cavalry from out of state, most significantly for $28 million in TV ads from a super PAC aligned with Senator Mitch McConnell, the Senate minority leader.
Mr. Vance on his own has raised $10.5 million, after his campaign was supported almost exclusively by a super PAC funded by $15 million from the Silicon Valley billionaire Peter Thiel, who once employed Mr. Vance. After Mr. Vance won his primary, Mr. Thiel moved on to other races.
On Friday, Ms. McDaniel reminded reporters that polls in Ohio historically have widely missed support for Republicans.
“J.D. is actually polling higher than President Trump was heading into the election in 2020,” she said. Mr. Trump went on to win the state by eight percentage points.
“What people were seeing in the polling is not new in this state,” Mr. Vance told reporters. “It always overstates things to the benefit of the Democrats.”
With a little more than one week before the election on Nov. 8, Mr. Ryan has been making an appeal to unity in these fractured times.
“I know you feel the same way as I do,” he told activists in an autoworkers union hall in Cleveland on Thursday night. “I don’t want any more hate. I don’t want any more anger.” He added: “I want people who care about each other. I want some forgiveness. I want some grace.”