I can debunk this. I saw the clip and the reporter only said that "not everybody" was changing party affiliation to vote for Trump. I'm sure that most of them are Trump voters. With the race between Bernie and Shrillary being so close, I doubt that many Democrats are looking to play the "operation chaos" game.
I agree. While it would be somewhat amusing if a bunch of dumb Hillary supporters ended up costing her Iowa by switching parties and attempting to play games with the Republican Caucus. The fact of the matter is the democrat caucus is way too competitive for voters to be doing that. I'm guessing the ones that are switching are "non-voters" who just happen to be registered democrat and are most likely going for Trump.
I wonder if it’s possible for someone to go in and vote D, and then go back in to re-register and vote R (or the opposite)?