I think how pay gets determined is pretty broad - experience, how people look, what they bring to the job. But there's no question women are paid less. Women don't ask.

When I joined Bill Clinton's start-up presidential campaign in 1991, I was confident that women would play an ever more important role, but I never gave a minute's thought to what would happen if we won. When we did - and I became the first woman to serve as White House press secretary - it changed my life. But it didn't change the world.

Part of Obama's persona is self-reliance. He's calm; he's cool; he's self-possessed. In many ways, he has tried to define himself in opposition to Clinton's sometimes needy, often undisciplined, emotionalism.

While eschewing emotion - and its companion, vulnerability - Obama should be careful not to sacrifice empathy, the 'I feel your pain' connection that sustained Clinton. This connection is the shorthand people use to measure their leaders' intentions. If people believe you're on their side, they will trust your decisions.

President Clinton intentionally created a structure that was a little loose. And one that kept him a little in the center. He didn't want one person filtering all the information that went to him. He had always operated with a lot of information coming in and a lot of stuff going out.

I am encouraged to see women are being elected in Chile, Argentina, Liberia, Ireland. More is more.

Many differences are rooted in biology and reinforced through culture, so it's important to acknowledge that. Because if you say men and women are the same and if male behaviour is the norm, and women are always expected to act like men, we will never be as good at being men as men are.