National Journal's Charlie Cook says Mitt Romney needs to mind the gender gap.
In a recent Pew survey, Cook notes that Barack Obama leads Romney by 13 points among women, but Romney leads among men by just 6 points.
When you break things down by age group, the differences get even more star. Among women over the age of 50, Obama wins by 7 points, but among women under 50, Obama wins by a staggering 18 points. Among men, Romney wins those over the age of 50 by 11 points, but Obama wins men under 50 by just one point.
Cook says that's a recipe for disaster.
Given that women generally make up 51 to 52 percent of the electorate, whenever Republican candidates lose women by more than they win among men, they can skip ordering the champagne for election night. In all but the most unusual cases, a Republican needs to win among men by a wider margin than a Democrat does among women.