Its more of an "Obama effect" where so much Pop-Culture TV and Celebrity media has hyped Obama up as a mythical icon who is perfect and unfallable and no one, especially impressionable women will publicly denounce Obama to pollsters.
Women voters are fearful of public ridicule, peer pressure, and gossip. So Women will tell you "whatever you want to hear" because they don't want to be shunned by their friends.
Can Obama live up to the "Media Hype and expectations"?
If Obama loses, it will be because the Women have publicly supported Obama, but privately have voted for Romney because he will be more focused on economic improvements.
Polls are anonymous, dimwit.