Actually, I had another thought on this, the questioner may have been a plant. I think this is becoming more and more prevalent in all of the campaigns. The advisers want to control everything, a la the FEMA fake press conference. I'm somewhat sceptical of the fainters and some of the questioners. One of Hillary's campaign stops had a man saying something sexist, I don't remember what he said, but it seemed a little too over the top. I think it turned out to be a radio DJ. I wouldn't put it past the campaign to have arranged the whole thing.
The last thing is any campaing wants is for their candidate to speak off the cuff and risk saying something that hasn't been tested on a focus group. Thus each candidate memorizes a stock reply to all anticipated questions. If asked a question not prepped for, segue to a prepared question and answer. Better yet, get the questioner to ask only questions that the campaigner is prepared for.
If that seems over the top, perhaps it is. But in one of the Republican debates (I think it was the CNN one), several so called undecided voter questioners turned out to be Democratic party operatives. At least one was flown to the debate site by CNN. Smoke and mirrors, it's an integral part of politics.