Welcome to Tax Day, when you paid your fair share, the nation's largest corporations didn't, and the eight companies that spent the most on lobbying, for a total of $540 million, all saw their tax rates go down, according to a Sunlight Foundation report. Exxon Mobil tops the list: For a mere $82 million, they got to save over $565 million in taxes. How it works here, more dirty corporate tricks here, street theater with the Tax Dodgers at Trump Tower here.