The tragedy two years ago thrust her and her husband into a new kind of spotlight. Tuesday marks a moment in which they are turning all that focus and attention -- as well as their passionate calls for stricter gun control -- into a political movement.

"We can't be naive about what it will take to achieve the most common-sense solutions," they wrote in their op-ed. "We can't just hope that the last shooting tragedy will prevent the next. Achieving reforms to reduce gun violence and prevent mass shootings will mean matching gun lobbyists in their reach and resources."

"We have experienced too much death and hurt to remain idle. Our response to the Newtown massacre must consist of more than regret, sorrow and condolence. The children of Sandy Hook Elementary School and all victims of gun violence deserve fellow citizens and leaders who have the will to prevent gun violence in the future."