The clarification is worse than the original statement. In the original statement, Mr. Jackson made clear that any civilian weapon should be limited to 5 rounds. I think his stance is wrong, but he's entitled to his opinion, which he honestly offered.
In the clarification, he suggests that he was talking about true, select-fire assault weapons. You know, the ones that cost thousands of dollars and require a $200 tax stamp... after a background check. Politically, this is much more palatable, because there are so few full-auto shooters out there. It's also spin. Most of the magazine fed full-auto weapons have semi-auto clones, so there would be no way to restrict magazines for full-auto weapons without restricting them for everyone. Full-auto weapons are already heavily regulated; legally owned full-auto weapons are almost never used in crimes. An NRA BoD member should know that when the media refers to assault weapons, they aren't restricting the definition to full-auto weapons.
Personally, I think the clarification is an insult to my intelligence.
If the NRA is the only game in town, then they had better get on my side if they want my support. What does my side believe? It believes "shall not be infringed" doesn't leave any wiggle room.