Nate Silver crunches numbers for The New York Times. Here he looks at the famous gender gap, the differences between men and women in voting. Although he never mentions the trope, it is the Mommy Party vs. the Daddy Party revisited - women are more likely to vote Democrat, men are more likely to vote Republican.
Silver doesn't deal with the "why" issue, except to raise and then discredit the economic differences between the genders. Many have focused on the so-called "women's issues" of abortion and contraception, I suspect the issues are more varied.