Hadiya Pendleton's parents advocate for gun control

WASHINGTON -- The parents of gun violence victim Hadiya Pendleton were in Washington Tuesday to make a call to stop gun violence across the country.

Cleopatra and Nathaniel Pendleton are advisory board members for the group Every Town for Gun Safety. That group, along with the group Moms Demand Action for Gun Sense in America, have launched a "Not One More" postcard campaign in which Americans can send postcards asking their state leaders to take action against gun violence.

"Our daughter Hadiya, our smart, motivated daughter, was shot and murdered... on Chicago's South Side on January 29, 2013," said Cleopatra. "And in the months that followed, we watched as our elected officials and Congress failed to pass common sense background check legislation."

More than 2.4 million postcards will be delivered later this week.