Former US President Barack Obama claimed on Friday that democracy was at stake in the November 8 midterm elections in the United States.

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At a campaign rally in Georgia, he encouraged voters to vote to prevent conspiracy theorists from getting their hands on the levers of power.

“We need to elect quality people to all polling stations. Across the country, people who have tried to undermine our democracy are running for positions to oversee the next election,” he told the crowd gathered in suburban Atlanta.

"And if they win, we don't know what might happen," he warned.

In Georgia, two extremely close duels, fueled by tens of millions of dollars, captivate America.

Democrat Raphael Warnock, the first black senator ever elected in this state with a heavy segregationist past, is trying to get re-elected against Herschel Walker, a former American football champion supported by Donald Trump and also African-American.

This election could decide which way the US Senate leans for the next two years.

A fierce battle is also being played out for the post of governor, where Republican Brian Kemp is opposed to a very influential figure in the Democratic Party, Stacey Abrams.

Obama also mentioned the right to abortion.

"Women everywhere should be able to control and have a say in their own bodies," he said.

Americans have already started voting in elections that will decide control of both houses of Congress, as well as governors in dozens of states.

Hundreds of other county and state positions will also be decided in the Nov. 8 election.