Elon Musk is spending big to boost Trump’s turnout. Republicans worry it might flop.

Tech billionaire Elon Musk has placed a huge bet on boosting former President Donald Trump’s campaign ground game – but it’s an open question whether that wager will pay off.

Mr. Musk has dropped just shy of $75 million into America PAC since July, according to documents filed with the Federal Election Commission (FEC) this week, making him one of the biggest-spending supporters of the former president in this campaign cycle. His group has spent more than $110 million in all, most of it on get-out-the-vote operations to boost Mr. Trump’s fortunes. The new super PAC is coordinating closely with the Trump campaign to spur voter turnout in the key presidential battleground states for the former president, taking advantage of new FEC guidance that for the first time allows close coordination between campaigns and outside groups.