I've read at least half a dozen articles and polls by several major pollsters including gallup. Go to google and try this search and you'll turn up a bunch of them:
I spent an hour or so googling, there was two people that actually did any work, the other articles are based on their "research".
Anna Greenberg and Noam Scheiber, two leftist koolaid drinkers are the ones trying to say security moms are a myth.
If you can make sense out of their hand-waving fine, I couldn't.
Anna says the gender gap is less than normal but says it is not security related. Noam is like Kerry, throw enough numbers around and hope that people will just accept his premise.
Oh and Anna as part of her analysis narrows her results to only include white married women as possible security moms, guess she doesn't think blacks or hispanics care about their kids, go figure.