Tis the season of polls.
For the next 14 months, we will be barraged with political polls that will often seem more confusing than enlightening. For example, Rudy Giuliani leads the race for the Republican nomination in three August polls, but his lead over Fred Thompson is either a whopping 13 points (Gallup and Quinnipiac) or a meager three points (Rasmussen). On the Democratic side, Hillary Clinton leads the race in four August polls, but her margin over Barack Obama is ...