I have heard Sue Myrick on local talk radio programs as a guest. I believe she is doing more than grandstanding but has sincerely espoused this cause. A man from this area (and her Congressional district), while on vacation on the coast, was killed by a drunk driver ... an illegal alien who had been arrested numerous times and just slapped on the wrist repeatedly. She has been quite outspoken at the outrage that not only did this man possess an NC driver's license but that he should have been deported several years ago.
And I sincerely hope she has too. But politicians, even the Sainted Republican Version, are notable for being good actors. Some have even made the jump from one profession to the next (although Fred Thompson seems to be the only guy who went from politician to successful actor!).