You'd think that General Motors Co., having been rescued by U.S. taxpayers, would be more up-front with them. In an ad that has been blanketing the airwaves since last week, General Motors Chairman and chief executive Ed Whitacre boasts that "we have repaid our government loan, in full, with interest, five years ahead of the original schedule." In a press release, Whitacre said GM was able to repay the loans "because more customers are buying vehicles like the Chevrolet Malibu and Buick LaCrosse." Neither the ad nor the press release mentioned that GM repaid its government loan with other government...