Few in the odd coalition of Left and Right pushing for reauthorization of the 81-year-old Export-Import Bank have been louder than Democratic presidential candidate Hillary Clinton. “It’s wrong that candidates for president, who really should know better, are jumping on this bandwagon,” she said at a May 22 campaign stop in New Hampshire. “It’s wrong, it’s embarrassing. . . . The idea that we would remove this relatively small but vital source of funding for our businesses to compete is absolutely backwards.” Clinton’s defense of Ex-Im may be motivated by more than mere concern for American businesses. Critics have argued...