The head of the Secret Service accepted full responsibility Thursday for last week's security breach at President Barack Obama's first state dinner, but he said that the president and Vice President Joe Biden were never in danger from a party-crashing couple who shook hands and posed for pictures with them. Secret Service Director Mark Sullivan told the House Homeland Security Committee that his agents were at fault for allowing uninvited Washington socialites Tareq and Michaele Salahi into a lavish state dinner for Indian Prime Minister Manmohan Singh. Sullivan told the committee that three uniformed agents had been put on administrative...