Republicans lead in three out of four demographics, in decreasing order:
married men by about 60-40
single men by about 55-45
married women by about 52-48
But trail among the largest cohort
single women by about 32 - 68
This women is the problem. This is why we have Obama, Biden, Hillary.
The problem is, the men gave us Bush, and would have given us McCain and Romney.
Clinton gave China MFN status with Republican support, and Bush made it permanent. Both sides are responsible for a lot of what is happening now.