...More important than the deficit, more important then healthcare-more important than anything-we have got to do something about our energy strategy. Because if we permit the climate to continue to warm at an unsustainable rate, and if we keep on doing what we're doing until we're out of oil and we haven't made the transition, then it's inconceivable to me that our children and grandchildren will be able to maintain the American way of life and that the world won't be much fuller of resource-based wars of all kinds.

In science, if the last 50 years were the age of physics, the next 50 years will be the age of biology.

When you strip away all the little things that divide us, it's important to remember how tied we are

Abortion should not only be safe and legal, it should be rare.

I am grateful to President George W. Bush for PEPFAR, which is saving the lives of millions of people in poor countries and to both Presidents Bush for the work we've done together after the South Asia tsunami, Hurricane Katrina and the Haitian earthquake.

Music, to me, was - is - representative of everything I like most in life. It's beautiful and fun, but very rigorous. If you wanted to be good you had to work like crazy. It was a real relationship between effort and reward. My musical life experiences were just as important to me, in terms of forming my development, as my political experiences or my academic life.

A lot of wonderful people love their country and hate the military.