According to Politico.com...
Capitol Police spokeswoman Kimberly Schneider says the man did not make an explicit threat against the president. -- (6:35 p.m.)
More details on Capitol Hill arrest: The man walked up to a “birdcage,” one of the Capitol Police guard shacks in the driveway. When challenged for identification, the man was "talking funny," according to a CP officer. Police asked whether he had any weapons, he told them that he had a .22 caliber rifle. -- John Bresnahan (5:56 p.m.)
Capitol police have arrested a man on the Hill who said he had a delivery for President Obama and a rifle. -- Josh Gerstein (5:30 p.m.)