What is/has Walker done about the sanctuary cities in his own state?
Have you organized any rallies over the issue? Have you offered to testify at hearings on the issue? A regular citizen's passion on issues can be very powerful and plays well on the news. If you can't get your local or state government to hold hearings, have you thought of holding your own hearing and inviting news organizations to report on it. It isn't as hard as you think. You may be allowed to use a room at a local/state govt center. Invite several experts and regular citizens to testify. You can facilitate, but let the experts run the show. I have even more suggestions if you want them.