Today, more than ever before, science holds the key to our survival as a planet and our security and prosperity as a nation. It's time we once again put science at the top of our agenda and work to restore America's place as the world leader in science and technology.

We proved that we are still a people capable of doing big things and tackling our biggest challenges.

I would say that I have been consistent in my broad view of how American power should be deployed, and the view that we underestimate our power when we restrict it to just our military power. We shortchange our influence and our ability to shape events when that's the only tool we think we have in the toolbox.

I think that part of my optimism comes from the belief that we as a people could actually, regardless of all the disadvantage of the past, regardless of the fact that a lot of other folks got a head start in the race, if we were able to make the race fair right now.

One of the things that we have to change in this country is the idea that people can't disagree without challenging each other's character and patriotism. I have never suggested that Sen. McCain picks his positions on national security based on politics or personal ambition. I have not suggested it because I believe that he genuinely wants to serve America's national interest. Now, it's time for him to acknowledge that I want to do the same. Let me be clear: I will let no one question my love of this country.

I don't think there's a lot of dispute for this. You can argue that we didn't get everything done that we wanted to get done, but I can make a really strong argument, and I think prove, that by almost every measure the country's better off now than when I started.

Who cares if it's a campaign strategy, and who are other people to say it's ridiculous? I'm not gay, but I strongly support gay marriage. What if someone told you you couldn't marry the one you love? I think it's about time! Let people who love each other that are the same sex get married. They deserve the right to be happy also.