The election campaign of the 44th U.S. president is now calling another candidate for the American presidency a "liar." This is a new low. It is amazing and depressing to hear this term being used as a formal strategy by people at the highest level of American politics.

"Liar" is a potent and ugly word with a sleazy political pedigree. But "liar" is not being deployed only by party attack dogs or the Daily Kos comment queue. Mitt Romney is being called a "liar" by officials...