Capitol Police arrested a staffer for Sen. Cory Booker who was carrying a gun Monday evening, hours after the New Jersey Democrat kicked off a marathon “filibuster” speech in the upper chamber. “Yesterday afternoon a Member of Congress led an IDed staff member around security screening at the Hart Senate Office Building. Later that evening, outside the Senate Galleries, the IDed staff member — who is a retired law enforcement officer — told our officers he was armed,” a rep for US Capitol Police said in a statement Tuesday. “The staff member, 59-year-old Kevin A. Batts of New Jersey, was...