I can’t think of a time when poll numbers have shown us quite so clearly the shift of opinion in a campaign as clearly as those from Florida this cycle.

Let’s start with the seven polls conducted between Thanksgiving and Christmas, at a time when Newt Gingrich was riding high in national polls. The table shows the dates of the earliest and latest interviews and the average percentages for Mitt Romney, Newt Gingrich, Rick Santorum and Ron Paul, the candidates now remaining in the race, and the percentage margin for the leader over the candidate in second place.