Add actual malice since the NRA is a public figure or organisation.
The statement is stupid and misleading and seems to contain ample malice, but people are also entitled to speak with some poetic latitude.
"My mother-in-law is worse than Hitler" is certainly untrue and defamatory, but hyperbole is an accepted device.
Contrast that with falsely accusing a private citizen of murder in your local paper, knowing it is false, and causing him the loss of his livelihood. That's the sort of fat pattern in which litigation might result in a judgment for the plaintiff.