Nobody's mentioned the Trojan Horse Theory?
I was sitting near these two guys at a conference earlier this week and one of them wouldn't stop talking to the other one about how Trump and the Clintons are in a secret plot to undermine the Republican chances in 2016 by putting Trump out there as a legitimate GOP candidate when he's really a diehard Dem.  Barring the nomination, Trump will run as an Independent, regardless of any silly pledge.  This guy had all sorts of details about golf outings and other secret meetings; sweetheart financing deals made to Trump's businesses through Bob Rubin and other ex-Clinton administration financiers.  It was fascinating, really.