I don't think anyone was planted. However, it was clear that most of the questioners were not all that undecided. I'd estimate that about 80-90% if the questioners were clearly supporters of the Democrat agenda. No surprise as Crowley selected the questioners and their questions. She also clearly favored Obama. Go back and look at the tape. She cut off both candidates, but almost exclusively cut off Obama on what was clearly his conclusory sentence while repeatedly cutting of Romney just as he was landing a haymaker.
It wasn't a town-hall. It was a moderated debate in town-hall clothing.
BTW, IMO no one won the debate. I would say that Romney lost it less. But Obama needed the win. The polls should remain steady with a slight Romney lead.