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.

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.

Yes, Bill Clinton is a big flirt.

During my years as a press secretary, I developed a powerful internal filter, which worked to strip all things 'off message' from my thoughts before they came out of my mouth. It didn't always work, of course, and I said more than a few things I regretted.

Washington is still very much a male-oriented culture. Being from Los Angeles, I think it is less so there - there is less attachment to tradition, perhaps, there is more flexibility, more acceptance of change generally. That is partly because of Hollywood.

On the day I started college in 1979, no woman had ever been on the United States Supreme Court or served as the Speaker of the House. None had been an astronaut or the solo anchor of a network evening news broadcast. Not one had been president of an Ivy League college or run a serious campaign for president.

The exposed nature of life in the public square affects leaders' attitudes toward risk - and failure.