Former Rep. Gabby Giffords, D-Ariz., and her husband Mark Kelly at Wednesday's Senate hearing about gun violence. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

Neil Heslin brought a framed photo of himself and his son Jesse (when the boy was an infant) to Monday's hearing in Hartford, Conn. The 6-year-old was killed at Sandy Hook Elementary School in December's shooting. Cloe Poisson/Hartford Courant /MCT /Landov hide caption

itoggle caption Cloe Poisson/Hartford Courant /MCT /Landov

President Obama at the White House today, with Vice President Biden in the background. Mandel Ngan/AFP/Getty Images hide caption

itoggle caption Mandel Ngan/AFP/Getty Images

At a gun shop in Phoenix, a customer holds a handgun. Among the executive actions President Obama is expected to propose is an expansion of background checks for gun buyers. Ralph D. Freso /Reuters /Landov hide caption

itoggle caption Ralph D. Freso /Reuters /Landov

Shotguns sit on display at a gun show in Stamford, Conn., last week. Demand has risen for firearms as the White House prepares its new plan for gun control measures. New surveys find that a majority of Americans support some measures. Timothy A. Clary/AFP/Getty Images hide caption

itoggle caption Timothy A. Clary/AFP/Getty Images

Handgun barrels on the assembly line of Hi-Point Firearms in Mansfield, Ohio. Gus Chan/The Plain Dealer /Landov hide caption

itoggle caption Gus Chan/The Plain Dealer /Landov

Meet the Press host David Gregory holds what he described as a high-capacity ammunition magazine during the Dec. 23 program. Uncredited/AP hide caption

itoggle caption Uncredited/AP

Vice President Biden and President Obama at the White House on Dec. 19. Biden has been charged with drawing up "concrete proposals" on how to reduce gun violence. Fang Zhe/Xinhua /Landov hide caption

itoggle caption Fang Zhe/Xinhua /Landov

A gun shop in Glendale, Calif. Gabriel Bouys /AFP/Getty Images hide caption

itoggle caption Gabriel Bouys /AFP/Getty Images