On the red and white barn at Dominic Marchese's place hangs a banner proclaiming his support for Donald Trump.

The 74-year-old organic beef farmer was a Democrat, but he has lost faith in the party after eight years of Barack Obama. He wants a president who is going to shake up the Washington culture.

He says American politicians are not working for the people.

"They go down there to work for us, they end up voting for the measures lobbyists work for, so not in our best interests," he said.

"These people are political whores."

Once an industrial powerhouse, Ohio has lost thousands of jobs, many in the steel industry. ( ABC News: Zoe Daniel )

Ohio, once an industrial powerhouse, has lost hundreds of thousands of jobs due to the combined impact of the Global Financial Crisis and a modernising economy.

Many here blame free trade deals like NAFTA for sending jobs offshore, so Mr Trump's promise to wind back globalisation and to focus on domestic economic growth resonates, even though economists say that will make things worse.

Mr Marchese said Mr Trump had changed the face of politics whether he went on to win or not, because his supporters had now mobilised.

"Future races will be a bloodbath because they're not going to go away," he said.

"We want America to be productive again and people working.

"It's not going to go away."

Mr Marchese is just one member of the group Farmers for Trump in north-eastern Ohio.

At a gathering of around a dozen, his concerns are repeated again and again by men who see job creation and the return of industry to Ohio as the highest priority.

"I believe if Trump doesn't win this election the United States as we know it will never, ever, ever be a world power again so this election, this year, is for the soul of our nation not just for a four-year vote," farmer Nick Furrie said.

There is a deep distrust of Hillary Clinton in this group.

"We really need a firm hand in this country to straighten out Washington and I tell you there's a lot of people that have the same sentiment that I think he has a very good chance no matter what our media's saying, because they are biased," Tom Yuhasz said.

The farmers represent Mr Trump's strongest base, and they may well win him Ohio where he has the sliver of a lead of 1.1 points.

Although demographics are changing making Ohio less representative, it would be a symbolic victory in a state that has been the bellwether in US elections for more than a century.

Many of the job losses here have been in the steel industry, and although jobs have been created in other sectors, it is a structural change that is proving difficult to absorb.

Steelworker Dan Moore voted for Mr Obama in the last two elections, but he has lost patience.

Donald Trump supporter steelworker Dan Moore has lost patience with Obama. ( ABC News: Zoe Daniel )

"There's a really rising sense of anger, frustration and disenfranchisement that nobody in Washington DC is listening," he said.

He is now voting for Mr Trump.

"I think we are at that point where a lot of people including myself are calling for a second American revolution and a lot of people look at Donald Trump as the candidate who is most likely to bring that about in a peaceful and legal manner."

Mr Trump will campaign in Ohio tomorrow.