Wealthy libertarians are giving big to Republican presidential candidate Rand Paul.
Three super PACs supporting the Kentucky senator say they raised a combined $6 million through June 30.
That's on top of the $7 million Paul's campaign reported raising between his April announcement and the end of last month.
Super PACs have no limits on how much they can raise, but they cannot directly coordinate with the candidate they're helping.
Donors to the super PACs include Jeff Yass, a high-frequency trader and board member of the libertarian Cato Institute, and George Macricostas, head of a data center company called RagingWire.
Paul is one of the expected 17 major GOP candidates for president. The total raised by his campaign and allied groups puts him in the top six for fundraising.