SpaceX and Tesla founder Elon Musk participates in a town hall-style meeting earlier this year in Pennsylvania.

Credit: Shutterstock / Anna Moneymaker Billionaire Elon Musk's super PAC is ramping up spending on key races in the midterm elections, filings show - and it's so far spent more backing Ken Paxton's U.S. Senate run than any other race.

Musk's America PAC has spent $6. 3 million to help Texas' Republican attorney general in his run for national office and to oppose his Democratic rival, James Talarico, according to Federal Election Commission (FEC) filings.