It's moving fast now.
I don't know how to do links, but you can cut and paste.
http://www.desmoinesregister.com/story/news/elections/presidential/caucus/2016/01/30/iowa-secretary-state-calls-cruz-mailers-misleading/79522560/
and NYT
http://www.nytimes.com/politics/first-draft/2016/01/30/iowa-official-criticizes-cruz-campaign-over-mailer/?_r=0