Anther obstacle for the GOP has to face is ingrained hatred women, minorities and even young whites have for white males. Every image they see on TV shows the evil criminal as a white male. From mayhem on the insurance commercials, to the sexual predator on the TV crime show, to bullies and drug pushers on the videos kids are shown in schools, all white males without exception. So people see a white male candidate they have an ink blot reaction, Romney equals evil.
This association is so main stream that Democrats and hosts on news shows use it as a pejorative, "just another rich white guy", "are Republicans too white and too male?" etc.