If we do nothing, we are handing our children a ticking time bomb that will require they pay ever greater payroll taxes just as they are beginning their careers, starting their own families and staking their claim to the American Dream.

I think where [Donald Trump] loses most hawkish republicans is when he talking about how much he likes [Vladimir] Putin. That should make any person who believe in the American exceptionalism, incredibly uncomfortable.

That's Joe Biden right there - unbowed, unbroken and unable to stop talking.

We cannot forever hide the truth about ourselves from ourselves.

For decades we have been living lives of abundance, with little regard for our natural resources or global health. But we are now facing hard choices in our energy policy. Future generations - my children and grandchildren, along with yours - will have to live with the decisions we make today. And so it is time for us to make some tough and - hopefully - smart choices regarding our energy use and production before it is too late.

As almost anyone with war experience knows, you're never supposed to show the enemy what you won't do to win.

The question is not whether you would like to be president or not. The question is: Do you think you can win and do you want to run? And none of those are clear to me.