(RNS1-apr11) Symbolic grave markers are placed April 11, 2013 on the National Mall in Washington, DC as part of a 24 hour vigil held by religious leaders who will call upon Congress to vote on legislation to prevent gun violence. For use with RNS-NEWTOWN-GRAVES, transmitted on April 11, 2013, Photo by Chris Kleponis/ Lifelines to Healing, PICO National Network/Sojourners.