From a surprisingly even-handed piece from NBC News, the jury is still out:

With new groups, a revamped strategy, more money and unprecedented collaboration, the gun control movement has made headway. Organizations like Everytown for Gun Safety, the group backed by former New York City Mayor Michael Bloomberg, say they are moving the needle.

“Now, for the first time in our country’s history, there is a well-financed and formidable force positioned to take on the Washington gun lobby,” said Shannon Watts, founder of gun control group Moms Demand Action for Gun Sense in America, speaking at an Everytown event on Capitol Hill in May.

Whether that is possible remains to be seen.

In 2012, according to the article, pro-gun groups raised $285 million dollars more than anti-gun groups. Now, with cash infusions from the likes of former NYC Mayor Michael Blowhard, as well as Gabby Gifford’s PAC, that disparity is shrinking.