When it comes to political campaigns, candidates are inclined to invoke voices from the grave to support their own election. Presidential candidates especially like to quote previous presidents. A new online feature by the New York Times is going to try to keep candidates honest. A range of expert opinions will be sought when candidates draw on history. Called “Historically Corrected,” the first installment challenged President Obama’s upbeat rhetoric about American achievements in the past in building the transcontinental railroad and the interstate highway system. “We built this country together,” Obama likes to say. In fact, many of the grand achievements in the past were products of political conflict and bickering, just like Obama’s own health-care law (New York Times, Campaign Stops, July 7).