Using only the power of scientific thinking, I proffer the following falsifiable prediction:   

Mitt Romney is hiding the fact that the he was one of the 5000 wealthy American tax-dodgers that Swiss bank UBS turned over to US authorities, as part of a USDOJ-brokered 2009 deal, which both fined UBS for hiding rich American’s money in a massive tax-evasion scheme, and offered the 5000 rich Americans “amnesty” (from criminal prosecution, trials & prison time), if they paid back the tax revenues they stole from US Treasury during the previous years.