Ever since his Bush-bashing 60 Minutes report, the CBS icon has been the right wing’s favorite whipping boy (well, they weren’t exactly fans before then, either). But when he leaves the anchor’s chair on March 9, he has no intention of giving up the fight. A LIGHT SNOW dusts the sprawling CBS News complex in Hell’s Kitchen, on New York’s West Side, as a figure in a black slouch hat and long trench coat swirls through the Fifty-seventh Street door, bids good cheer to the security guards in the lobby, then vanishes into the bowels of the newsroom: Dan Rather...