I believe that climate change is the great global crisis that we face, environmental crisis. I believe that if you're serious about climate change, you don't encourage the excavation and transportation of very dirty oil.

I think people cast their votes for a number of reasons. I think if you look at your polls, you'll probably find that many, many people think that our views are closer to what they believe the future of America should be. That our views are closer on economic issues. And a lot of those polls come down to demographics, to age, to how much money you are making.

At a time when the average student is graduating from a four-year college $27,000 in debt, when hundreds of thousands of capable young people no longer see college as an option because of high costs and when the U.S. is falling further and further behind our economic competitors in terms of the percentage of young people graduating from college, no agreement should be passed which, over a period of years, makes a bad situation worse and will make college even less affordable than it is today.

...Poverty in America today leads not only to anxiety, unhappiness, discomfort and a lack of material goods. It leads to death. Poverty in America today is a death sentence for tens and tens of thousands of our people.

I think what you've got are millions of people who are in trouble today. They really are. They're confused. They're working longer hours for lower wages. They're seeing productivity going up but their kids are worse off economically than they are. They're looking at a campaign finance system in politics and they see corruption, big money buying elections. Nobody in Congress is listening to them.

Climate change is real, caused by human activity and already devastating our nation and planet. The United States must lead the world in combating climate change and transforming our energy system away from fossil fuels and toward energy efficiency and sustainability.

Here's something that I believe we have to do as we put together an international coalition, and that is we have to understand that the Muslim nations in the region - Saudi Arabia, Iran, Turkey, Jordan - all of these nations, they're going to have to get their hands dirty, their boots on the ground. They are going to have to take on ISIS.