Paul Kevin Curtis, suspected of sending ricin-tainted letters to President Obama and other public officials, was released on bond today, a day after a court hearing in which investigators said they found no evidence of the poison in Curtis' home or car. The U.S. Marshals office in Oxford, Miss., confirmed that Curtis had been released from jail, where he had been kept since last week on formal charges of sending threats through the mail. … Curtis was formally charged last week with sending mail that contained a threat to kill or harm the president and with sending mail containing a...