It’s worth noting that while NRA hasn’t let loose all of the grassroots force through an alert calling for specific action on Holder, they haven’t been silent.
Since he was nominated, I have received at least three stories from them via daily emails with warnings for members about Holder’s positions. They are at least educating, even if they aren’t calling for action. Elections have consequences. You can’t realistically expect the incoming President with the most anti-gun record in history to appoint pro-gun people.