It is a great analogy. Trump had an event in Chicago, he cancelled it. Call it out of safety concerns or whatever, but the fact of the matter is that he cancelled it rather than being the bad-ass and speaking there anyway.
Show me an example where Trump left a venue with tail between his legs after being shouted at.
I don't have any, because Trump prior to his ride down the escalator and declaring his candidacy was beloved and respected by the Left, so none of his appearances at events didn't get interrupted by shouting, barking leftists.
Trump cancelled the Chicago rally after a mob of Democrat agitators started to get violent. O’Malley was flapping his is gums in a bar. Cuccinelli should have pulled out his phone, started recording and asked the dirtbag to repeat what he said.