Megan McArdle announces she’s leaving The Atlantic for Tina Brown’s Newsweek.  Maybe the money’s better, but Ms. McArdle’s professional progress has been for progressively worse publications:  she used to write for the excellent Economist, then for The Atlantic (never the same after Michael Kelly’s death) and now for Ms. Brown’s $1.00 magazine.  She’s now paired again with the increasingly demented Andrew Sullivan; is she’s his journalistic beard?