In the world of White House politics and the politics of handling the White House press corps, the president's press secretary is the most visible target and often the first to fall when the media turns on an administration. And it appears that press secretary Jay Carney may well be approaching the point at which his deft handling of the media in past years suddenly becomes a liability in the middle of not just one but multiple presidential controversies. I have known a few other past presidential press secretaries, but not Carney. As a rule of thumb, I would say...