Few challenges facing America and the world are more urgent than combating climate change. The science is beyond dispute and the facts are clear.

We ask for nothing more than the chance to blaze our own trail, and yet each of us is only here because somebody, somewhere, helped us find our path. That`s part of what makes America exceptional. We are family and we`ll do anything to help each other along the way.

Our journey is not complete until all our children... know that they are cared for and cherished and always safe from harm.

Tonight, we gather to affirm the greatness of our nation - not because of the height of our skyscrapers, or the power of our military, or the size of our economy. Our pride is based on a very simple premise, summed up in a declaration made over two hundred years ago.

Let's say I'm on the policy wonk end of the spectrum. As much as I can dive into a briefing book and really work to master various subjects that come before my desk, I'm still not an expert on a huge amount of the stuff that we work on.

And that means that no matter how we reform health care, we will keep this promise to the American people: If you like your doctor, you will be able to keep your doctor, period. If you like your health care plan, you'll be able to keep your health care plan, period. No one will take it away, no matter what.

Now, some have said I blame too many problems on my predecessor, but let's not forget that's a practice that was initiated by George W. Bush.