You can read more about it on The Patriot Perspective WordPress page. David Gregory Violates DC Gun Law On National TV —– Update: CNN’s Don Lemon Admits To Breaking Gun Laws, Too? The text of the D.C. law is posted there, if you want to read it.
EDIT 12/26/12: Not even half way there yet.
EDIT, early 12/27/12: DC Police investigating MSNBC's David Gregory for possessing illegal ammo clip Mwahahaha!!
It seems that NBC asked about the magazine, the police told them it wasn't allowed, but they ignored them and carried on anyway.
I know that there's lots of stupid crimes, I've seen the TV shows and read the reports, but usually they don't involve asking the police beforehand, doing it anyway, announcing it, recording it on video, broadcasting it nationwide, and putting the video on the internet for the whole world to see. THAT is a kind of stupid, the likes of which I have not seen in a very long time!