“The NRA probably endorsed Carson over his primary opponent, but endorsing Carson over Coburn doesn’t seem likely.”
Why?
The NRA has a habit of downgrading the 2A ratings of pro-gun politicians who won’t vote for their anti-gun compromises (and vice-versa). One example here in Texas: in the 2006 mid-term election, NRA endorsed Shane Sklar (D) over Ron Paul (R), a GOA A+ rated incumbent.
Damn. You Ron Paul crazies even have the NRA on your conspiracy list. I love it.