So how does that work exactly? Let's say you are a Trump supporter showing up to caucus and the Cruz people are "being aggressive and immovable". What's to stop you from ignoring them and walking over to stand in the Trump circle?
IIRC, an Iowan on here who is heavily involved in the caucusing process pointed out the other day that the GOP doesn't hold their caucuses the same way as the Democrats.
The GOPers basically listen to speeches and then cast secret ballots. The Democrats cluster into groups and aggressively go after anyone not in their circle until the bell rings.
My recollection from 2008 is that some folks were blatantly using racism as a method to "persuade" people to support Obama. "If you go and stand in that corner, everyone will know that you're a racist!! All the good people are standing in this corner with me!!"
Obviously a lot of people wouldn't be moved by such childish behavior, but I think enough were "guilted" into supporting Obama.
Also, if reasonable people get together to discuss the merits of one candidate over another, conceivably some real persuasion might take place. But again, in 2008, I think one group was open to discussion and the other group just said "You're a racist!" and I think some people said "Whatever, I'll go stand wherever you want me to stand if you just shut up."
2016 is different. And another poster said that Republicans in Iowa have a more secret sort of ballot so the unreasonable pressure may be more easily avoided.
But my basic thought is that neither the Trump nor the Cruz crowds seem like they want to discuss or persuade anyone in a civil manner. I think the caucuses may be a little rough this time.