JACK SHAFER: “Why the g*ddamn hell is Barack Obama writing the cover story for next week’s Newsweek (which, like Slate, is owned by the Washington Post Co.)? He doesn’t know anything about Haiti outside of what his aides may have told him. He won’t even write it! If the piece is worth publishing, Newsweek should give the byline to its true author.” That would establish an ugly precedent where politicians’ pieces are concerned. . . .