Two days later, CNN reported on the sites that they called "fake", and today they broke the news that the NRCC had made a change, making it "less misleading."
The NRCC has left the official-campaign-sounding URL's ("SinemaForCongress", "AnnKirkpatrick", and "RonBarber2014") in place, and the "home pages" still lead with banners saying "______ for Congress". However, now, when you hit equally-large "Donate" button, you are taken to an NRCC page clearly identifying that you are making a contribution to defeat the incumbent you first thought that you were "for".
For example, the "Sinema For Congress" donate page went from
We welcome your comments about this post. Or, if you have something unrelated on your mind, please e-mail to info-at-arizonaspolitics-dot-com or call 602-799-7025. Thanks.