For all the fuss on cable news about the real chance of a Trump nomination or Presidency, the guy who predicts stuff pretty well, Nate Silver of Five-Thirty-Eight writes a pretty compelling piece on why the chances are still pretty long.
The main reason is the number of people really paying attention doesn't spike till some votes are cast. Mr. Silver makes a point, but the Trump phenomenon has had legs so far and the primary obstacle (Jeb) is so low energy now, its hard to see him recovering. However, when you look at the endorsement primary and the money primary, you wouldn't think so.
If Cruz wins Iowa and The Donald wins NH and SC, then its all about the Florida primary and that could end Jeb and Marco.