Summary: <p>President Barack Obama urges lawmakers to pass gun control legislation as Republicans threaten a Senate filibuster. In Connecticut, unsealed search warrants for the Newtown shooter reveal a large stash of weapons and ammunition. The Supreme Court hears arguments in two cases involving same-sex marriage. Questioning by the Justices suggests the Court might strike down DOMA, the Defense of Marriage Act. The so-called "Gang of Eight" senators visits the U.S.-Mexico border. Housing prices reach the highest levels in six years but consumer confidence drops. And North Dakota passes the nation's strictest abortion laws. A panel of journalists joins Diane for analysis of the week's top national news stories.</p>
