Passion?

Jamelle Bouie of Slate explains why the NRA has more power than groups fighting for more gun regulation:

The NRA’s power is as much a function of passion as it is resources. As the Times reports, the organization spends just $20 million annually on political activities. Its influence comes from its members, who are hypervigilant against any effort to curb gun rights. The enthusiasm gap between gun activists and gun-control advocates is huge. According to the Pew Research Center, 42 percent of those who favor gun rights have either contributed money to a pro-gun organization, contacted a public official to express an opinion on gun policy, expressed opinions on guns on social media, or signed a petition on gun policy. By contrast, only 25 percent of those who prioritize gun control have done the same.

By the way, for the regulation side, I have signed petitions, written letters, and given money.