“Trump’s lead may shrink or vanish after what some are calling ‘his Dr. Ben Meltdown’ in Iowa.”
Only as a result of media/poll manipulation.
The only way Trump melts down is if he stops being himself, or starts wimping out and walking back his strong statements on immigration. That would be the end of his campaign. Being an aggressive attack dog and going a little over the top is fine with his supporters, which I’m one of.