The chairman of the Davidson County Democratic Party has resigned because of child pornography allegations. Rodney Mullins stepped down Thursday, but has not been arrested. Police searched a computer at the party headquarters in Metro Center. Tennessee Democratic Party Chairman Randy Button released a statement Friday about the investigation into Mullins. The statement read in part, "We have been informed that Rodney Mullins, former Chair of the Davidson County Democratic Party, has resigned. We are further informed that Mr. Mullins is being investigated concerning crimes involving child pornography. If true, this is very disturbing and regrettable news. We don’t have...