It is interesting, but not surprising. The Republicans are reaping the rewards of their renewed drive to put ideas like contraception and other women's health issues back on the table as political targets. Mitt wants to cut funding to Planned Parenthood (or "Get rid of it" to use his words)? Cool. Noted. Mostly by female voters.
Good point aj3, I would definitely agree that Obama is winning the female vote by a substantial margin. Did you watch the GOP convention? If so, you will recall how hard they tried to make Romney appealing to the fairer sex. Guess it didn't work.