I guess I don't see this question as an ambush or gotcha question because I don't think anyone would have predicted she'd have given such a nonsensical answer. My guess is that the person who asked the question was as shocked by her answer as anyone.
So why ask it? Well, there has been all sorts of talk about how divided the country is, splitting into "red" and "blue" America, etc. so maybe it was a question intended to draw an analogy, or have her answer what the likelihood might be of history repeating itself.
Not a great question, but I honestly think her answer could not have been predicted.