Remembering the victims: Earlier this month, two mourners paused at a makeshift memorial in Newtown, Conn., for the children and adults killed at Sandy Hook Elementary School. Zhang Chuanshi /Xinhua /Landov hide caption

itoggle caption Zhang Chuanshi /Xinhua /Landov

Stuffed animals and flowers at a makeshift memorial near the entrance to the grounds of Sandy Hook Elementary School. Brendan Smialowski /AFP/Getty Images hide caption

itoggle caption Brendan Smialowski /AFP/Getty Images

A Sig Sauer handgun on sale at a shop in Tucker, Ga. Erik S. Lesser /EPA /LANDOV hide caption

itoggle caption Erik S. Lesser /EPA /LANDOV

A woman and child earlier this week at a makeshift memorial in Newtown, Conn. Shannon Stapleton /Reuters /Landov hide caption

itoggle caption Shannon Stapleton /Reuters /Landov

U.S. Marine Corps Reserve Sgt. Craig Pusley stood guard Wednesday at Hughson Elementary School in Modesto, Calif. Ed Crisostomo /MCT /Landov hide caption

itoggle caption Ed Crisostomo /MCT /Landov

Vice President Biden watched as President Obama spoke earlier today in the White House briefing room. Mandel Ngan /AFP/Getty Images hide caption

itoggle caption Mandel Ngan /AFP/Getty Images

Candles with the names of victims of the Sandy Hook Elementary School shooting, at a makeshift memorial near the entrance to the grounds of Sandy Hook Elementary School. Brendan Smialowski /AFP/Getty Images hide caption

itoggle caption Brendan Smialowski /AFP/Getty Images

At the Freddie Bear Sports shop in Tinley Park, Ill., Jason Zielinski shows AR-15 style rifles to a customer. Scott Olson/Getty Images hide caption

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Nancy J. Lanza, mother of suspected mass shooter Adam Lanza, was one of the 26 victims of the mass shooting on Friday. Handout/Courtesy of family of Nancy Lanza via Getty Images hide caption

itoggle caption Handout/Courtesy of family of Nancy Lanza via Getty Images