William D. Cohan, a former investment banker and the author of “Money and Power: How Goldman Sachs Came to Rule the World”:

Without mentioning the heroics Romney has accomplished in his IRA, the New York Times editorialized on July 10 that the rest of Romney’s opaque “tax avoidance” schemes — including overseas shelters in the Cayman Islands, Switzerland and elsewhere — amount to nothing short of a “financial black hole” that he would be well advised to explain to the public. He should put explaining his magical IRA at the top of the list.