The Obama campaign’s resurrection of “liar” as a political tool is odious because it has such a repellent pedigree. It dates to the sleazy world of fascist and totalitarian propaganda in the 1930s. It was part of the milieu of stooges, show trials and dupes. These were people willing to say anything to defeat their opposition. Denouncing people as liars was at the center of it. The idea was never to elevate political debate but to debauch it.