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Volunteers place grave markers on the National Mall as over 3,300 crosses, stars of David, and other religious symbols are placed to remember those affected by gun violence, on April 11, 2013 in Washington, DC. Clergy from Newtown, Connecticut, and others will begin a 24- hour vigil to urge Congress into passing tougher gun laws. (Photo by Mark Wilson/Getty Images) ( 166301533 )

Volunteer Jesse Epp-Fransen helps place grave markers on the National Mall as over 3,300 of the crosses, stars of David, and other religious symbols are placed to remember those affected by gun violence, on April 11, 2013 in Washington, DC. Clergy from Newtown, Connecticut, and others will begin a 24- hour vigil to urge Congress into passing tougher gun laws. (Photo by Mark Wilson/Getty Images) ( 166301528 )

The sun rises above the U.S. Capitol as volunteers place crosses symbolizing grave markers on the National Mall in Washington on April 11, 2013. The PICO National Network's Lifelines to Healing and Sojourners are holding a 24-hour vigil featuring a gathering of Newtown clergy and 3,300 grave markers to "remind Congress action is needed on gun violence prevention." The number 3,300 represents the supposed number of people who have died as a result of gun violence since the tragedy in Newtown, Connecticut. REUTERS/Kevin Lamarque ( USA-GUNS/ )

Volunteers place grave markers on the National Mall as over 3,300 crosses, stars of David, and other religious symbols are placed to remember those affected by gun violence on April 11, 2013 in Washington, DC. Clergy from Newtown, Connecticut, and others will begin a 24- hour vigil to urge Congress into passing tougher gun laws. (Photo by Mark Wilson/Getty Images) ( 166301535 )

A volunteer places crosses symbolizing grave markers on the National Mall in Washington April 11, 2013. The PICO National Network's Lifelines to Healing and Sojourners are holding a 24-hour vigil featuring a gathering of Newtown clergy and 3,300 grave markers to "remind Congress action is needed on gun violence prevention." The number 3,300 represents the supposed number of people who have died as a result of gun violence since the tragedy in Newtown, Connecticut. REUTERS/Kevin Lamarque ( USA-GUNS/ )

A volunteer carries a stack of crosses symbolizing grave markers to be placed on the National Mall in Washington April 11, 2013. The PICO National Network's Lifelines to Healing and Sojourners are holding a 24-hour vigil featuring a gathering of Newtown clergy and 3,300 grave markers to "remind Congress action is needed on gun violence prevention." The number 3,300 represents the supposed number of people who have died as a result of gun violence since the tragedy in Newtown, Connecticut. REUTERS/Kevin Lamarque ( USA-GUNS/ )

Activists place crosses on the National Mall for victims of gun violence April 11, 2013 in Washington, DC. The activists gathered to begin a 24 hour vigil on the National Mall with over 3,000 crosses for victims of gun violence in the United States since the Sandy Hook School shooting last December. BRENDAN SMIALOWSKI/AFP/Getty Images ( 518822422 )

House Speaker John Boehner of Ohio takes questions from reporters on gun control, immigration and the budget during a news conference on Capitol Hill in Washington, Thursday, April 11, 2013. (AP Photo/J. Scott Applewhite) ( Boehner )

House Speaker John Boehner of Ohio takes questions from reporters on gun control, immigration and the budget during a news conference on Capitol Hill in Washington, Thursday, April 11, 2013. (AP Photo/J. Scott Applewhite)) ( Boehner )

U.S. Senators Richard Blumenthal (D-CT) (L-R), Christopher Murphy (D-CT) and Charles Schumer (D-NY) meet with the family members of gun violence victims in Washington April 11, 2013. The U.S. Senate cleared the way on Thursday for an emotional, weeks-long debate on proposals to curb gun violence, rejecting an effort by conservative Republicans to block consideration of gun-control legislation prompted by December's Newtown school massacre. REUTERS/Gary Cameron ( USA-GUNS/ )

Jillian Soto (R) listens to U.S. Senator Richard Blumenthal (D-CT) at a news conference for family members of gun violence victims in Washington April 11, 2013. Soto's sister Victoria, was a first grade teacher at Sandy Hook Elementary School who was killed in last December's massacre. The U.S. Senate cleared the way on Thursday for an emotional, weeks-long debate on proposals to curb gun violence, rejecting an effort by conservative Republicans to block consideration of gun-control legislation prompted by December's Newtown school massacre. REUTERS/Gary Cameron ( USA-GUNS/ )

Jillian Soto (L) and Miya Rahamim (2nd L) attend a news conference for family members of gun violence victims in Washington April 11, 2013. Soto's sister Victoria, was a first grade teacher at Sandy Hook Elementary School who was killed in last December's massacre, while Rahamim's father was killed in a workplace shooting. The U.S. Senate cleared the way on Thursday for an emotional, weeks-long debate on proposals to curb gun violence, rejecting an effort by conservative Republicans to block consideration of gun-control legislation prompted by December's Newtown school massacre. The two women on the right are unidentified. REUTERS/Gary Cameron ( USA-GUNS/ )

Jillian Soto (L) cries next to Miya Rahamim (R) during a news conference for family members of gun violence victims in Washington April 11, 2013. Soto's sister Victoria, was a first grade teacher at Sandy Hook Elementary School who was killed in last December's massacre, while Rahamim's father was killed in a workplace shooting. The U.S. Senate cleared the way on Thursday for an emotional, weeks-long debate on proposals to curb gun violence, rejecting an effort by conservative Republicans to block consideration of gun-control legislation prompted by December's Newtown school massacre. REUTERS/Gary Cameron ( USA-GUNS/ )

Erica Lafferty (L) and Jillian Soto (R), who both lost relatives in the Sandy Hook Elementary School shootings, attend a news briefing with (rear, L-R): Senators Christopher Murphy (D-CT), Richard Blumenthal (D-CT), and Charles Schumer (D-NY) in Washington April 11, 2013. The U.S. Senate cleared the way on Thursday for an emotional, weeks-long debate on proposals to curb gun violence, rejecting an effort by conservative Republicans to block consideration of gun-control legislation prompted by December's Newtown school massacre. REUTERS/Gary Cameron ( USA-GUNS/ )

U.S. Senator Patrick Toomey (R-PA) (C) speaks to reporters outside the Senate Chamber in Washington April 11, 2013. The U.S. Senate cleared the way on Thursday for an emotional, weeks-long debate on proposals to curb gun violence, rejecting an effort by conservative Republicans to block consideration of gun-control legislation prompted by December's Newtown school massacre. REUTERS/Gary Cameron ( USA-GUNS/ )

With the U.S. Capitol in the background, crosses symbolizing grave markers are placed upon the National Mall in Washington April 11, 2013. The PICO National Network's Lifelines to Healing and Sojourners are holding a 24-hour vigil featuring a gathering of Newtown clergy and 3,300 grave markers to "remind Congress action is needed on gun violence prevention". The number 3,300 represents the supposed number of people who have died as a result of gun violence since the tragedy in Newtown. REUTERS/Kevin Lamarque ( USA-GUNS/ )

With the U.S. Capitol in the background, members of the clergy pass through a field of crosses symbolizing grave markers on the National Mall in Washington April 11, 2013. The PICO National Network's Lifelines to Healing and Sojourners are holding a 24-hour vigil featuring a gathering of Newtown clergy and 3,300 grave markers to "remind Congress action is needed on gun violence prevention". The number 3,300 represents the supposed number of people who have died as a result of gun violence since the tragedy in Newtown. REUTERS/Kevin Lamarque ( USA-GUNS/ )

Hundreds of crosses, representing gun deaths since the Newtown, Connecticut elementary shootings, are placed on the National Mall on April 11, 2013 in Washington, DC. Two US senators have reached a compromise that would expand background checks for gun sales, an official said, in what could result in the most ambitious change to gun laws since 1994. The deal comes four months after the Connecticut shootings that took the epidemic of gun violence in the United States to an alarming new level. KAREN BLEIER/AFP/Getty Images ( 518817819 )

Clergy and other activists stand among crosses on the National Mall for victims of gun violence on April 11, 2013 in Washington, DC. The activists gathered to begin a 24 hour vigil on the National Mall with over 3,000 crosses for victims of gun violence in the United States since the Sandy Hook School shooting last December. BRENDAN SMIALOWSKI/AFP/Getty Images ( 518822430 )

With names of the Newtown dead upon her stole, a member of the clergy takes part in a prayer service to prevent gun violence on the National Mall in Washington April 11, 2013. The PICO National Network's Lifelines to Healing and Sojourners are holding a 24-hour vigil featuring a gathering of Newtown clergy and 3,300 grave markers to "remind Congress action is needed on gun violence prevention". The number 3,300 represents the supposed number of people who have died as a result of gun violence since the tragedy in Newtown. REUTERS/Kevin Lamarque ( USA-GUNS/ )

A member of the clergy becomes emotional after speaking about gun violence during a prayer service on the National Mall in Washington April 11, 2013. The PICO National Network's Lifelines to Healing and Sojourners are holding a 24-hour vigil featuring a gathering of Newtown clergy and 3,300 grave markers to "remind Congress action is needed on gun violence prevention". The number 3,300 represents the supposed number of people who have died as a result of gun violence since the tragedy in Newtown. REUTERS/Kevin Lamarque ( USA-GUNS/ )