"In the normal course of things, the establishment front-runner provides coherence to the field. Hence, the expectation that the field would have Jeb Bush and a not-Bush, or maybe two. For the moment, this assumption has collapsed, as the current shape of the field is Trump and everyone else. This is quite the comedown for Bush."
An excellent overview (from a usually clueless pundit) of why everyone but Trump is failing so badly this primary season. -- Nuggetsman