Nonpartisan groups like the United Physicians of Newtown formed to draw attention to guns as a public health issue. It started with few doctors looking for their children in a neighborhood firehouse right after the Sandy Hook shooting, and it's since swelled to 110 doctors – ranging from emergency room physicians to podiatrists.
"Whether it be any other disease, you can basically find the factor that goes into it ... so you can target and treat it," said Dr. James Bruno, a urologist whose daughter was in the school during the shooting. "If this is going to be addressed in a nonpartisan, constructive way, we want to look at the cause of these things."
Still, it will take time.
The NRA has contributed more than $21 million toward political candidates since 1990, and another $29 million on lobbying since 1998, according to the Center for Responsive Politics. The NRA did not respond to ABCNews.com's request for comment.
"When we care enough about children to do something, are we going to let a single lobby overrun what the vast majority of people want?" Hemenway asked.