Four more women said Thursday that they had been subject to unwanted sexual advances by Mayor Bob Filner of San Diego, as the San Diego County Democratic Party joined the chorus of Democrats demanding his resignation. The women — who include a dean at San Diego State University and a retired Navy rear admiral — made their accusations in interviews with KPBS News. A total of seven women have said they were mistreated by the mayor. Despite crumbling support, Mr. Filner has said he would not step down. He has acknowledged inappropriate behavior but has said he is not guilty of sexual harassment.