A convicted sex offender from McMinnville faces child exploitation charges after he tried to solicit who he thought was a 14-year-old girl to have sex with him, the teen girl turning out to be an undercover Internet crimes officer.The suspect, David Eli Cramer, 50, of Dogwood Pointe, was arrested on Valentine’s Day when he showed up at what he thought was the Morristown residence of the girl. However, instead of “the girl” who he had been speaking with in a chatroom and on cellphone texts for weeks, he found lawmen waiting with federal warrants to arrest him. He now stands charged with attempted enticement of a minor for sexual purposes, attempted production of child pornography, and, after a search of his home here in McMinnville, possession of child pornography.According to the federal indictment, Cramer began chatting with the undercover officer in January after coming across “her” in a chat room on the Internet.