America now stands as the world's foremost power. We should be proud: Not since the age of the Romans have one people achieved such preeminence. But we are not Romans; we do not seek an empire. We are Americans, trustees of a vision and a heritage that commit us to the values of democracy and the universal cause of human rights.

If the threat is jihadism - and it is - and the threat is the destruction of Syria so that all of these refugees are swamping into Europe and changing the whole character and politics of Europe, this is the time to unite to find a way out.

I can tell you, Massachusetts, fastest growing sector of our economy is clean energy and energy efficiency companies. And they're growing faster than any other sector.

If you think I would have gone to war the way George Bush did, don't vote for me.

So the threat of Saddam Hussein with weapons of mass destruction is real.

What we need now is not just a regime change in Saddam Hussein and Iraq, but we need a regime change in the United States.

Strong leadership demands more than the willingness to use force. It means directing the use of the right tools at the right time for the right purpose and the right cause.