People hold signs with names of gun violence victims in front of the Capitol Hill during a march in Washington D.C., capital of the United States, Jan. 26, 2013. Thousands of people, including family members of victims and survivors of shootings at Virginia Tech University, Sandy Hook elementary school and others, took part in a march for stricter gun control laws here on Saturday. (Xinhua/Zhang Jun)

People hold signs against gun violence during a march in Washington D.C., capital of the United States, Jan. 26, 2013. Thousands of people, including family members of victims and survivors of shootings at Virginia Tech University, Sandy Hook elementary school and others, took part in a march for stricter gun control laws here on Saturday. (Xinhua/Zhang Jun)

People hold signs against gun violence during a march in Washington D.C., capital of the United States, Jan. 26, 2013. Thousands of people, including family members of victims and survivors of shootings at Virginia Tech University, Sandy Hook elementary school and others, took part in a march for stricter gun control laws here on Saturday. (Xinhua/Zhang Jun)

People hold signs against gun violence in front of the Washington Monument during a march in Washington D.C., capital of the United States, Jan. 26, 2013. Thousands of people, including family members of victims and survivors of shootings at Virginia Tech University, Sandy Hook elementary school and others, took part in a march for stricter gun control laws here on Saturday. (Xinhua/Zhang Jun)

Six-year-old Dylan Wolos holds a sign against gun violence in front of the Capiotl Hill during a march in Washington D.C., capital of the United States, Jan. 26, 2013. Thousands of people, including family members of victims and survivors of shootings at Virginia Tech University, Sandy Hook elementary school and others, took part in a march for stricter gun control laws here on Saturday. (Xinhua/Zhang Jun)

A girl holds a sign against gun violence during a march in Washington D.C., capital of the United States, Jan. 26, 2013. Thousands of people, including family members of victims and survivors of shootings at Virginia Tech University, Sandy Hook elementary school and others, took part in a march for stricter gun control laws here on Saturday. (Xinhua/Zhang Jun)

People hold signs with names of gun violence victims in front of the Capitol Hill during a march in Washington D.C., capital of the United States, Jan. 26, 2013. Thousands of people, including family members of victims and survivors of shootings at Virginia Tech University, Sandy Hook elementary school and others, took part in a march for stricter gun control laws here on Saturday. (Xinhua/Zhang Jun)

People hold signs against gun violence in front of the Capitol Hill during a march in Washington D.C., capital of the United States, Jan. 26, 2013. Thousands of people, including family members of victims and survivors of shootings at Virginia Tech University, Sandy Hook elementary school and others, took part in a march for stricter gun control laws here on Saturday. (Xinhua/Zhang Jun)

People hold signs against gun violence in front of the Washington Monument during a march in Washington D.C., capital of the United States, Jan. 26, 2013. Thousands of people, including family members of victims and survivors of shootings at Virginia Tech University, Sandy Hook elementary school and others, took part in a march for stricter gun control laws here on Saturday. (Xinhua/Zhang Jun)

People hold the picture of Benny Wheeler, a victim of the Sandy Hook school shooting, in front of the Capitol Hill during a march in Washington D.C., capital of the United States, Jan. 26, 2013. Thousands of people, including family members of victims and survivors of shootings at Virginia Tech University, Sandy Hook elementary school and others, took part in a march for stricter gun control laws here on Saturday. (Xinhua/Zhang Jun)

People hold signs against gun violence in front of the Washington Monument during a march in Washington D.C., capital of the United States, Jan. 26, 2013. Thousands of people, including family members of victims and survivors of shootings at Virginia Tech University, Sandy Hook elementary school and others, took part in a march for stricter gun control laws here on Saturday. (Xinhua/Zhang Jun)