They don't support the Second Amendment in practice. Their "massive political pull" has been a net negative.
Back it up those general statements with some facts.
I can't possibly even imagine how you believe that the NRA doesn't support the Second Amendment.
I also triple dog dare you to come up with even a handful of 'net negative' items when compared against over a century of positive influence in EVERY aspect of gun ownership and use there possibly is.
One could argue that WITHOUT the NRA, we wouldn't even have gun clubs, ranges and competitions that encourage and support gun ownership, firearms education, etc... They were after all the ones who started it all and kept it going even in the face of opposition.