One thing which I think the political press is actually very aware of but doesn't quite write about enough is that for many people, a presidential campaign is their career opportunity.  I'm not accusing people of corruption.  There's no contradiction between working for (or supporting) a candidate and hoping you get to ride his/her coattails for a career.  It's fine.  But it is the case that for some, betting on a candidate is also betting on themselves.  They win, you win.  Hopefully, anyway.