Though America PAC declined to discuss details of its work, the group's commitment confirms Musk's uniquely powerful role in Republican politics.

Liberals currently hold a 4-3 advantage on the court, but the retirement of a liberal justice this year put the ideological balance in play.

The court could face cases on abortion, congressional maps and labor unions. With Tesla suing the state, Elon Musk is backing the conservative candidate who's received President Trump's endorsement.

Taking the stage in Green Bay wearing a yellow foam cheesehead hat, Elon Musk gave out $1 million checks on Sunday to two Wisconsin voters.

Speaking at a rally Sunday night, Musk said "we just want judges to be judges", before handing out two $1m (£750,000) cheques to voters who had signed a petition to stop "activis

Elon Musk also promised smaller payments to others who help elect a conservative candidate to the state's top court in a closely watched election.

A Wisconsin judge on Saturday declined to stop billionaire Elon Musk from handing over $1 million checks to two voters in the state at a planned rally days before the closely contested Supreme Court election.

Elon Musk gave out $1 million checks on Sunday to two Wisconsin voters, declaring them spokespeople for his political group, ahead of a Wisconsin Supreme Court election that the tech billionaire cast as critical to President Donald Trump's agenda and “the future of civilization.

Wisconsin’s Democratic attorney general asked the state Supreme Court on Sunday to block presidential adviser Elon Musk from awarding $1 million prizes to voters for casting ballots in a high-stakes race for control of the court.