Mitt Romney's $250 million fortune is largely a black hole: Aside from the meager and vague disclosures he has filed under federal and Massachusetts laws, and the two years of partial tax returns (one filed and another provisional) he has released, there is almost no data on precisely what his vast holdings consist of, or what vehicles he has used to escape taxes on his income. Gawker has obtained a massive cache of confidential financial documents that shed a great deal of light on those finances, and on the tax-dodging tricks available to the hyper-rich that he has used to keep his effective tax rate at roughly 13% over the last decade.