Women Won This Time, But Men Are Voting's X-Factor

President Barack Obama's re-election makes it official: Women can overrule men at the ballot box.

For the first time in research dating to 1952, a presidential candidate whom men chose decisively, Mitt Romney, lost.

More women voted for Obama. It's surprising women didn't overrule men sooner, exit polls show they've been voting in larger numbers than men for almost three decades.

Men, who make up less than half the U.S. population, exercise power greater than their numbers. When it comes to presidential races, males as a group are more influential because they show less party loyalty than women, who have voted Democratic in the past six elections.

Men are the reason George W. Bush became president and John McCain didn't. And they made this year's race close.