Here is Howard Kurtz, official professional media critic of both theWashington Postand CNN, doing some important, trenchant analysis, as one would expect of all esteemed journalistic savants in his position: Twittering snide, resentful barbs about the level of difficulty in television comedian David Letterman's questions to Barack Obama last night, on the Late Show. David Letterman clapped when his guest Barack Obama came onstage, guys! Howard Kurtz shall grade this human's journalistic skills as an "F-", he will. Tut tut, Letter-man! [ Howard Kurtz/Twitter ]