You may want to prove that you're worthy of other kids or neighbors who were wealthier than you and teased you. You may want to prove that you're worthy of high expectations. But I do think that there is a youthful ambition that very much has to do with making your mark in the world. And I think that cuts across the experiences of a lot of people who end up achieving something significant in their field.

We need to reduce our dependence on foreign oil by ending the subsidies for oil companies, and doubling down on clean energy that generates jobs and strengthens our security.

The changes in thinking about same-sex marriage have come slowly at first and then in rapid course. If such change is possible in this area, is it also possible in the vexed and sordid realm of race relations?

I have become a symbol of the possibility of America returning to our best traditions.

What we should be asking is not whether we need a big government or small government, but how we can create a smarter and better government.

Donald Trump is uniquely unqualified to be president.

Don't just get involved. Fight for your seat at the table. Better yet, fight for a seat at the head of the table.