Anonymous super PACs have poured millions of dollars into advertising on both sides.
Ted Cruz and Hilary Clinton are the top recipients of hedge-fund campaign dollars.
An ex-candidate's super PAC is flush with donors' money, but no place to go.
Super PACs spent big money on the 2012 election. But some of the biggest donors didn't exactly get a good rate of return. So, can we expect more big spending the next election cycle?