In science, if the last 50 years were the age of physics, the next 50 years will be the age of biology.

Thomas Jefferson believed that to preserve the very foundations of our Nation, we would need dramatic change from time to time. Well, my fellow Americans, this is our time. Let us embrace it.

Let's adopt some short-term strategies to get growth going and then let's have a long-term debt reduction package. That's what I think we should do and I think it will work.

[Hillary Clinton] isinsatiably curious, she's a natural leader, she's a good organiser, and she's the best darn change maker I ever met in my entire life. This is a really important point for you to take out of this convention.

When I leave the office on January 20th, I will leave even more idealistic than I was the day I took the oath of office.

When some Republican governors asked to try new ways to put people on welfare back to work, the Obama Administration said they would only do it if they had a credible plan to increase employment by 20%. You hear that? More work. So the claim that President Obama weakened welfare reform's work requirement is just not true.

President Obama has offered a plan with 4 trillion dollars in debt reduction over a decade, with two and a half dollars of spending reductions for every one dollar of revenue increases, and tight controls on future spending. It's the kind of balanced approach proposed by the bipartisan Simpson-Bowles commission.