As we enter the general election Trump will increasingly resemble Reagan in any case, for the same negative claims made against him: that he is an extremist, that the White House is no place for a low-brow entertainer, that he is too unpopular with too many. The revival of the US probably rests on how the people react to that view, just as they did some thirty-five years ago.
If just one of the main parties had someone who was a bit normal, able to galvanise, able to connect with the man on the street, able to rise above the other weak willed leaders all around them, they'd walk this election. It's just a shame that the only leader who fits that description is in charge of UKIP.
Even Romney can spot that inequality is the current cause célèbre. However shoehorning a man who once said "corporations are people" into Russell Brand's "doyen of the downtrodden" plimsolls will be a Sisyphean task. It would be easier for Donald Trump to run as an African-American, or Hillary as a man.