CBS NewsBiden: GOP filibuster threat 'embarrassing'PoliticoVice President Joe Biden's frustration bordered on anger Tuesday as he scolded Republican senators for their "embarrassing" threats to block votes on gun legislation as the push that began after the Newtown shooting approached its make-or-break moment.Biden: Potential GOP gun filibuster is "mind-boggling"CBS NewsSandy Hook families push for votes on gun controlLos Angeles TimesBiden calls GOP filibuster threat 'mind-boggling'USA TODAYMSNBC -ABC News (blog) -The Associated Pressall 46 news articles »