Paul Kevin Curtis is seen dressed as an Elvis Impersonator in this picture taken in 1999. Federal prosecutors on Thursday charged Curtis with threatening to harm President Barack Obama and making other threats through the Postal Service. Curtis was arrested Wednesday in the FBI's investigation of letters believed to have contained the deadly poison ricin. Sen. Roger Wicker (R-MS), one of the intended recipients of the ricin-laced letters, said he had hired Curtis to play at a wedding as an Elvis impersonator a decade ago. [Photo/Agencies]