I believe, in the words of Dr. Martin Luther King Jr., that there is such a thing as being too late, and when it comes to climate change, that hour is almost upon us.

For me, personally, the most difficult moments had to do with not just terrorist attacks, but also shootings.

Basically, I am a night owl. My wife is an early bird, so she goes to bed around 9:30, and my kids are in bed about 8. So, if I am home, I will usually start writing about 9:30 and go till about 12:30 or 1:30, depending on what my energy level is.

I'll change the posture of our federal government from being one of the most anti-science administrations in American history to one that embraces science and technology.

We've taken bold action at home by making historic investments in renewable energy, by putting our people to work increasing efficiency in our homes and buildings, and by pursuing comprehensive legislation to transform to a clean energy economy.

It is my firm belief that it will be in the interests of the United States, especially our economic interests, to pursue comprehensive immigration reform.

I'm going to tell the American people what I believe will make this country great.