A while back (can't remember which thread) someone questioned if I really thought that the prospect of a Trump presidency was less scary than the prospect of Corbyn as Prime Minister, for which I'm entirely serious - Corbyn is an extremist true believer whereas Trump is a populist who could roll back from his extremes in reality if elected.
This BBC review of the candidates kind of matches what I'm thinking:
http://www.bbc.co.uk/news/election-us-2016-35413871 - The right-wing American equivalent of Corbyn isn't Trump from the sound of it, it is Cruz. Though at least Cruz doesn't seem to hate his own country but he is the closest equivalent I can see rather than Trump.