THEY can’t vote or even donate, but that hasn’t stopped these Australians from campaigning for Hillary Clinton in America.

Volunteers William Madani, 32, and Amanda McKenna, 29, are knocking on doors in the battleground state of Ohio for the Democratic presidential hopeful.

“This election is so significant for the entire planet — for global security, for global growth and trade, and for letting the world know what rhetoric is acceptable and what isn’t,” Mr Madani tells News Corp Australia from a campaign office in East Cleveland.

He landed in the US about three weeks ago from London, where he worked as a lawyer for four years. After the election, he will move back home to Sydney.

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In Ohio, he is a staging location director: managing volunteers, monitoring voter suppression efforts and reporting feedback to headquarters.

“I love these volunteers so much. A lot of them come from the community and have been around for a very long time,” Mr Madani says.

“One volunteer, Valena, believes that the struggle to give African-Americans the right to vote continues today, particularly given attempts by the other side to suppress turnout. She has so many amazing war stories.

“There’s a 14-year-old girl, Xaniya, who has spent weekend after weekend helping us knock on doors, making phone calls, organising other volunteers. Her school has given her credit and time off for her campaigning efforts. She opens my world to a community of politically passionate teenagers that I have no insight into whatsoever.”

Ms McKenna flew in from London on Friday, where she has worked in advertising for 4.5 years, to join her friend Mr Madani on the campaign trail. She said locals have been fascinated by her accent and that she’s crossed an ocean to campaign.

“It’s really nice when you get to meet people and hear their stories and they’re appreciative that you’re there from Australia,” Ms McKenna, a Melbourne native, says. “We had a woman today who just so thankful we were encouraging her to vote. She talked about how she was struggling to stay afloat and be a good mother and trying to get her sons to vote.”

Every vote counts in the Midwest state of Ohio, where Republican Donald Trump leads his rival by about one point, according to the latest polls.

Candidates who have clinched the bellwether state have won the White House in every election (except in 1944 and 1960) since the end of the 19th century.

Axiom Strategies & Remington Research Group Battleground Poll: @realDonaldTrump up in FL, NC, NV, OH; @HillaryClinton up in WI, PA, VA, CO. pic.twitter.com/QHrJbdScjp — Alex Swoyer, esq. (@ASwoyer) November 7, 2016

As the race tightens, power couple Beyonce and Jay Z, and basketball star LeBron James, have stumped for Ms Clinton in Cleveland, urging registered voters to cast early ballots.

Volunteers from around the world are joining in the effort.

A busload of Swedes arrived in Cleveland last week to door knock for Ms Clinton, Mr Madani said.

Jonathan Daly, 35, recently jetted in from Toronto, Canada in a final push for the Democratic candidate.

“I’m campaigning for Hillary because America is great. And I saw that greatness being threatened by someone claiming to want to make it great again. I have roots in the States, friends and family here, I’ve lived here; I have a brain. And so I couldn’t sit on the sidelines and just let that happen,” he says.

Follow William Madani on the campaign trail here.