The Trump campaign sent an appropriate mailer. It was polite and legal. It was posted here on FR. A professional and appropriate mailer.
I saw it and commented numerous times on that thread about that mailer. It had a nice letter thanking and asking for support, instructions on how and where to caucus. They even provided a voter registration for for those that needed it. I think they even included times when Jeeves would stop by with the Trump limo to pick up the family and drive to the caucus site where hot dogs and balloons were waiting.
I was impressed. I think Trump hide his ground game to sucker everyone in (media) and will unleash it Monday. His Iowa guy was not slouch to get Santorum from blank to winner in 2012. I think Trump and his campaign is re-writing politics and how it should be done. We will see on Monday won’t we?