The day after the Sandy Hook tragedy in 2012, Shannon Watts, a former communications executive and stay-at-home mom of five, founded Moms Demand Action for Gun Sense in America. Since then, the grassroots initiative has matured into a nationwide movement with over 6 million supporters fighting to end gun violence. Now the largest gun-prevention organization in the US, Moms Demand Action has had major successes at the ballot box, on school boards, city councils, in state...