Outside groups backing Republicans have spent more than $1 billion in 11 races that will decide control of the Senate, led by donations from Elon Musk, dark money groups, and the crypto industry.

Republicans are spending tens of millions of dollars in the final days of the campaign to rescue three red-state senators who party insiders say ignored months of warnings, according to Axios. Senate races in Kansas, South Carolina and Mississippi are normally easy GOP wins. This year, national Republicans have pulled…