“Has this had more play in Iowa media?”
googling shows some TV coverage in Iowa:
https://www.google.co/?gws_rd=ssl#q=cruz+mailer+iowa+secretary+of+state&tbm=nws
The real danger to Cruz though, is the fact that Iowa is a caucus state, where small groups from each Precinct gather and debate amongst themselves. A few articulate and passionate folks can easily sway the undecideds or those not fully informed. All it will take for the Trump supporters is to bring one of these mailers to each caucus.
https://www.google.com/?gws_rd=ssl#q=cruz+mailer+iowa+secretary+of+state&tbm=nws
Please don’t click on the link in my original post. I made an editing error. The above is the correct link.