Already, there is a curious bit of conventional wisdom taking hold that Mitt Romney's choice of Paul Ryan is shrewd because it will draw attention from Romney's ever-more apparent weaknesses, notably the more rapacious elements of his work at Bain Capital and his undisclosed tax returns. Sorry, but this makes no sense. It seems hard to imagine a running mate who would jibe better with the Democrats' Bain Capital attacks than a well-born Ayn Rand acolyte. More crucially, it is hard to imagine a running mate who will draw more attention to the matter of Romney's taxes than Paul Ryan. Why? Because under the "Ryan plan" that made the congressman famous, Mitt Romney would pay zero taxes.