There may come a time when we elect a president at age 45 or 50, and then 20 years later the country comes up against the same kind of problems the president faced before. People would like to bring that man or woman back but they would have no way to do so.

This has been a time of dramatic transformation, and you have risen to every new challenge.

When I was in England, I experimented with marijuana a time or two, and I didn't like it, and I didn't inhale, and I never tried again.

I have news for the forces of greed and the defenders of the status quo; your time has come and gone. It's time for change in America.

There has never been a time like this, in which we have the power to create knowledge and the power to create havoc, and both these powers rest in the same hands.

If the issue is, is it a near certainty that at some time in the future there will some group, probably a terrorist group, that attempts to bring to bear either the use or the threat of a chemical or biological operation, I would say that is highly likely to happen sometime in the next few years.