Father of Sandy Hook Elementary School shooting victim, Mark Barden introduces U.S. President <a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=Barack+Obama&family=editorial&specificpeople=203260 ng-click='$event.stopPropagation()'>Barack Obama</a> (3L) as former U.S. Rep. <a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=Gabrielle+Giffords&family=editorial&specificpeople=6961081 ng-click='$event.stopPropagation()'>Gabrielle Giffords</a> (2L), U.S. Vice President Joe Biden (5R) and family members of Newtown, CT shooting victims look on in the Rose Garden of the White House on April 17, 2013 in Washington, DC. Earlier today the Senate defeated a bi-partisan measure to expand background checks for gun sales.