Mitt Romney’s personal tax history is exactly the kind of political mystery that porn mogul and free speech advocate Larry Flynt would like to uncover. So he and Hustler are offering $1 million in cash for information on the presidential candidate’s “unreleased tax returns and/or details of his offshore assets, bank accounts and business partnerships” in full-page ads in USA Today and the Washington Post. “What is he hiding?”asks the ad. There’s a larger scan here.