It's no secret that Don Draper isn't the man he used to be — and we don't just mean Dick Whitman. Over the course of these past 25 episodes, Don's gone from lovable cad to unsympathetic prick. But when did Sterling Cooper's once-beloved creative director turn into Tony Soprano? Using our patented Drape-o-Meter, which measures the likability of any Mad Men character on a period-appropriate scale of JFK (likable) to Richard Nixon (unlikable), we track his decline — after the jump! Oh, and spoilers ahead, obviously.