Their personal families are shrinking, while their ranks are growing: Families whose loved ones have been killed or wounded by guns.

They vow this time is different. They're no longer a loose patchwork of grass-roots groups that emerge after the latest mass shooting -- only to get outspent by the NRA's war chest, their hopes for "common sense" gun measures dashed.

This time, they have the backing of former New York Mayor Michael Bloomberg and his $50 million donation. They are Everytown for Gun Safety, which in 2014 brought under one umbrella Bloomberg's two previous gun groups, Mayors Against Illegal Guns and Moms Demand Action for Gun Sense in America.

Their focus is on field operations, to mobilize their 3 million members on this single issue and then get supporters to the polls. They steal tactics from the National Rifle Association and study other groups like Mothers Against Drunk Driving that have won victories against massive industries.

http://www.cnn.com/interactive/2015/10/us/other-gun-lobby/