Here's a video from 2007 that, for me, says it all about Romney.
He comes across as callous, calculating, indifferent to anyone whom he disagrees with and, for that matter, screws with his narrative (whatever that may be at any given moment).
Lets put aside the issue of whether he agrees or disagrees with this gentleman. The fact is he has absolutely no interest in discussion. None. The concerns of a regular citizen are anathema to him if that person does not fall in line with what he considers reasonable subject matter.
Now...how would Bill Clinton or Barack Obama respond? I'd bet the farm that they'd engage this man for a little bit no matter what their position on the issue is. With Clinton, it's because he actually likes meeting and talking to people. Romney, obviously, has no use for those who cannot help him. This man may as well be a maggot.
Romney is a coward and completely unfit for the Presidency. It's just pathetic that anyone would find value in him as a candidate.