The idea has been floated in the past that liberals should join the NRA for voting rights in the organisation (to change its direction). That won’t work.

msnbc.com
Introducing the NRA’s Kingmakers (article from 2013)

The NRA board appoints a shadowy committee to handpick almost every candidate appearing on the ballot annually. The Nominating Committee members for this year’s NRA board elections include highly-connected Republican leaders, along with figures connected to the nation’s largest conservative lobbying group, gun manufacturers, and even the New York State Police, reporting and internal documents obtained by msnbc show.

The NRA board appointed nine individuals, including six board members and three people from outside the NRA, to the 2013 Nominating Committee last summer—before Mitt Romney’s loss in the presidential race and December’s Newtown, Connecticut Sandy Hook Elementary School shooting.

But few NRA members—less than 7%—even take the time to vote. “I don’t bother anymore,” posted an NRA member in California, under the screen name HunterJim, “the insiders have set this system up so no outsider is going to be elected.”

(More at MSNBC)