Greenberg formally pleaded guilty last month to six federal charges in a court hearing, admitting to a federal judge that he had knowingly solicited and paid a minor for sex.The guilty plea from Greenberg, a former Seminole County, Florida, tax commissioner, came after he struck a deal with federal prosecutors to avoid some of the other 33 federal charges he had faced that ranged from identity theft to fraud and bribery allegations.As part of the plea, Greenberg has agreed to