I would respectively disagree with your interpretation of what this is about.
First off, it has nothing to do with the 2nd Amendment except in the fact that it is related to hunting which guns are used for. It has everything to do with the 1st Amendment and hunting. If you read my explanation above about how certain forms of hunting could be interpreted as "animal cruelty" in various states and thus it would be illegal to make depictions (including photos and videos) of said hunting through the law being challenged. Sure the AGs say "we're against animal cruelty" but what this law does is make "animal cruelty" subject to the broadest restriction in any state across the whole nation.
If dove hunting is 'being cruel to animals' in Michigan (as we remember the shrills from the anti-hunting group's campaign against dove hunting here), then under federal law ANY depiction of hunting doves that goes into interstate commerce becomes illegal because dove hunting is illegal in Michigan. That goes for any activity, including in this case dogfighting. If you were to make a film about dogfighting in an area of the US where it is legal (I'm not sure if/where it would be) and then try to sell it elsewhere, you are in violation of this stupid law because dogfighting may be illegal in any Federal or State jurisdiction. The reason why dogfighting is being brought up is because it is a horrible act, and no federal prosecutor is going to go after you because of my dove hunting example. But the possibility still is there and may increase if this goes in the .gov's favor.
If US v Stevens is upheld for the government, you can expect to see a lot of hunting shows and magazines to be in trouble and harassed by animal rights groups. Other NRA highly ranked AGs may be on that list, but they are in direct opposition to the NRA, NSSF, and many outdoors magazines. Its about what is allowed by the 1st Amendment, and Mike Cox is apparently saying its ok to censor this stuff.
I respect the man, but I very strongly disagree with his position on this issue and thought some members here might want to know his position.